CN111912734A - Method for detecting preparation concentration of polyaluminium chloride and alumina in polyaluminium chloride solution - Google Patents
Method for detecting preparation concentration of polyaluminium chloride and alumina in polyaluminium chloride solution Download PDFInfo
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Abstract
The invention provides a method for detecting the preparation concentration of polyaluminium chloride and alumina in a polyaluminium chloride solution, and relates to the technical field of water purifying agents. The invention dries the container to constant weight, and the weight of the constant weight container is recorded as W1(ii) a Placing a sample to be detected of the polyaluminium chloride solution into the constant weight container, weighing the total mass of the sample to be detected of the polyaluminium chloride solution and the constant weight container, and recording as W2(ii) a Heating a container containing a sample to be detected of polyaluminium chloride solution until the liquid is evaporated to dryness and the weight is constant, weighing the total mass of the container with the evaporated material, and recording the total mass as W3(ii) a The heating temperature is 98-100 ℃; calculating the mass concentration C of the polyaluminium chloride in the sample to be detected of the polyaluminium chloride solution by using a formula 1Polyaluminium chloride. The detection method provided by the invention needs short time, only needs 30-60 min, does not need to use toxic and harmful reagents, only generates water vapor and does not output harmful waste liquid, and is more environment-friendly; and the method is accurate.
Description
Technical Field
The invention relates to the technical field of water purifying agents, in particular to a method for detecting the preparation concentration of polyaluminium chloride and alumina in a polyaluminium chloride solution.
Background
Polyaluminium chloride is a water purifying material, is an inorganic polymer coagulant, is also called polyaluminium for short, is called PAC for short, and is an inorganic polymer water treatment agent with large molecular weight and high charge, which is produced by the bridging action of hydroxide ions and the polymerization action of polyvalent anions.
The sewage treatment plant usually adopts solid PAC, and after a liquid with a certain concentration is prepared in a medicine dissolving tank, the solid PAC is added into a high-efficiency sedimentation tank to be fully mixed with sewage, so as to achieve the effects of removing phosphorus and turbidity. For sewage treatment plants, the formulated PAC needs to be checked for its formulated concentration of solid reagents by testing to ensure that the dosing is accurate and appropriate. Therefore, detecting the formulated concentration of PAC is also a common indicator of drug control in sewage treatment plants.
In the prior art, the concentration of prepared solution is calculated by detecting the content of alumina in prepared liquid PAC, and the detection method comprises the following steps: weighing about 8g of liquid sample, dissolving the liquid sample by using carbon dioxide-free water, fixing the volume to 250mL, transferring 10mL of the solution into a 250mL conical flask, adding 10mL of nitric acid solution, boiling for 1min, cooling to room temperature, adding 20mL of ethylene diamine tetraacetic acid disodium and 3-4 drops of thymol blue solution, neutralizing by using an ammonia water solution until the test solution is from red to yellow, boiling for 2min, cooling, adding 10mL of acetic acid-sodium acetate buffer solution and 2 drops of xylenol orange indicator, adding 50mL of water, titrating by using a zinc chloride standard solution until the solution is changed from light yellow to reddish to be an end point, simultaneously performing a blank experiment, obtaining the alumina content of the PAC solution by calculation, and calculating the preparation concentration of the solution by using the alumina content of solid PAC.
Although the detection scheme can detect the preparation concentration of PAC, the detection process needs 3-4 hours, the time spent is long, the detection steps are complex, various toxic and harmful reagents are needed, and related waste liquid is generated, so that secondary pollution to the environment is easily caused.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for detecting the concentration of polyaluminium chloride and alumina in a polyaluminium chloride solution, which has the advantages of short detection time, high efficiency, no use of toxic and harmful reagents, and reduced waste liquid generation.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for detecting the preparation concentration of polyaluminium chloride in a polyaluminium chloride solution, which comprises the following steps:
(1) drying the container to constant weight, weighing the mass of the constant weight container, and recording as W1；
(2) Placing a sample to be detected of the polyaluminium chloride solution into the constant weight container, weighing the total mass of the sample to be detected of the polyaluminium chloride solution and the constant weight container, and recording as W2；
(3) Heating the container filled with the sample to be tested of the polyaluminium chloride solution in the step (2) until the liquid is evaporated to dryness and the weight is constant, weighing the total mass of the container with the evaporated material, and recording the total mass as W3(ii) a The heating temperature is 98-100 ℃;
(4) calculating the mass concentration C of the polyaluminium chloride in the sample to be detected of the polyaluminium chloride solution by using a formula 1Polyaluminium chloride：
CPolyaluminium chloride(％)＝(W3-W1)/(W2-W1) X 100% of formula 1.
Preferably, the container in step (1) is a crucible; the capacity of the crucible is 100 mL.
Preferably, the drying temperature in the step (1) is 103-105 ℃.
Preferably, the mass of the sample to be tested of the polyaluminium chloride solution in the step (2) is 10-50 g.
Preferably, the heating temperature in the step (3) is 99 ℃, and the heating time is 10-30 min.
Preferably, the constant weight in the step (1) and the step (3) is independently that the weight error of two successive weighing times is less than or equal to 0.2 mg.
Preferably, the weighing in step (1) is performed after the dried container is placed in a dryer to be cooled to room temperature.
Preferably, the weighing in step (3) is performed after the container with the steam-dried substance left therein is placed in a dryer to be cooled to room temperature.
The invention provides a method for detecting the preparation concentration of alumina in a polyaluminium chloride solution, which comprises the following steps:
detecting the mass concentration of the polyaluminium chloride in the polyaluminium chloride solution according to the method of the technical scheme, and marking the mass concentration as CPolyaluminium chloride(ii) a The mass content of alumina in the solid polyaluminium chloride corresponding to the polyaluminium chloride solution is recorded as omegaAlumina oxideCalculating the mass concentration C of alumina in the polyaluminium chloride solution by using the formula 2Alumina oxide：
CAlumina oxide＝ωAlumina oxide×CPolyaluminium chlorideEquation 2.
The invention provides a method for detecting the preparation concentration of polyaluminium chloride in a polyaluminium chloride solution, which comprises the following steps: (1) drying the container to constant weight, weighing the mass of the constant weight container, and recording as W1(ii) a (2) Placing a sample to be detected of the polyaluminium chloride solution into the constant weight container, weighing the total mass of the sample to be detected of the polyaluminium chloride solution and the constant weight container, and recording as W2(ii) a (3) Heating the container filled with the sample to be tested of the polyaluminium chloride solution in the step (2) until the liquid is evaporated to dryness and the weight is constant, weighing the total mass of the container with the evaporated material, and recording the total mass as W3(ii) a The heating temperature is 98-100 ℃; (4) calculating the mass concentration C of the polyaluminium chloride in the sample to be detected of the polyaluminium chloride solution by using a formula 1Polyaluminium chloride. The method comprises the steps of heating a container containing a to-be-detected sample of the polyaluminium chloride solution at the temperature of 98-100 ℃, wherein the water state is between liquid and gas, the water in the solution is quickly gasified and separated, the polyaluminium chloride cannot be decomposed and is left on the container to be steamed and dried, and the concentration of the polyaluminium chloride in the polyaluminium chloride solution can be obtained by weighing and calculating the content of the steamed and dried substances in the solution. The method utilizes a physical evaporation method to detect the preparation concentration of the polyaluminium chloride in the polyaluminium chloride solution, the required time is short, and only 30-60 min of detection time is required; toxic and harmful reagents are not needed, only water vapor is generated, and no harmful waste liquid is produced, so that the method is more environment-friendly; in addition, a plurality of groups of samples can be detected simultaneously, and the container can be recycled, so that the working efficiency is further improved, and the detection cost is reduced. Moreover, the detection method provided by the invention is accurate, and compared with the common method for detecting the content of alumina in the solution by zinc oxide titration and calculating the concentration of PAC (polyaluminium chloride) in the solution, the relative error is less than 3.5 percent.
The invention also provides a method for detecting the preparation concentration of the alumina in the polyaluminium chloride solution, which comprises the following steps: according to the aboveDetecting the mass concentration of the polyaluminium chloride in the polyaluminium chloride solution by the method in the scheme, and marking the mass concentration as CPolyaluminium chloride(ii) a The mass content of alumina in the solid polyaluminium chloride corresponding to the polyaluminium chloride solution is recorded as omegaAlumina oxideCalculating the mass concentration C of alumina in the polyaluminium chloride solution by using the formula 2Alumina oxide. The method for detecting the preparation concentration of the aluminum oxide in the polyaluminium chloride solution has the advantages of short required time, high efficiency, no use of toxic and harmful reagents and reduction of waste liquid generation.
Detailed Description
The invention provides a method for detecting the preparation concentration of polyaluminium chloride in a polyaluminium chloride solution, which is characterized by comprising the following steps:
(1) drying the container to constant weight, weighing the mass of the constant weight container, and recording as W1；
(2) Placing a sample to be detected of the polyaluminium chloride solution into the constant weight container, weighing the total mass of the sample to be detected of the polyaluminium chloride solution and the constant weight container, and recording as W2；
(3) Heating the container containing the sample to be tested of the polyaluminium chloride solution in the step (2) until the liquid is evaporated to dryness and the weight is constant, weighing the total mass of the crucible container with the evaporated material, and recording the total mass as W3(ii) a The heating temperature is 98-100 ℃;
(4) calculating the mass concentration C of the polyaluminium chloride in the sample to be detected of the polyaluminium chloride solution by using a formula 1Polyaluminium chloride：
CPolyaluminium chloride(％)＝(W3-W1)/(W2-W1) X 100% of formula 1.
The invention dries the container to constant weight, and the weight of the constant weight container is recorded as W1. In the present invention, the container is preferably a crucible; the crucible is preferably a porcelain crucible, and the capacity of the crucible is preferably 100 mL; the drying is preferably drying, the drying temperature is preferably 103-105 ℃, more preferably 105 ℃, and the drying is preferably carried out in an oven. In the present invention, the weighing is preferably carried out by placing the dried container in a dryer and cooling the container to a temperature ofAfter room temperature. The present invention does not require any particular dryer, and those known to those skilled in the art can be used. In the invention, the constant weight is preferably that the weight error of two successive weighing is less than or equal to 0.2 mg; if the weight error of the two successive weighing is more than 0.2mg, the drying and the weighing are repeated according to the method until the weight error of the two successive weighing is less than or equal to 0.2 mg.
After the container is dried to constant weight, the sample to be tested of the polyaluminium chloride solution is placed in the constant weight container, and the total mass of the sample to be tested of the polyaluminium chloride solution and the constant weight container is weighed and recorded as W2. In the invention, the mass of the test sample of the polyaluminium chloride solution is preferably 10-50 g, and more preferably 30-50 g; when the preparation concentration of the sample to be tested of the polyaluminium chloride solution is higher, the mass of the sample to be tested of the polyaluminium chloride can be properly reduced within the mass range, otherwise, the mass of the sample to be tested of the polyaluminium chloride is properly increased; the sample to be tested of the polyaluminum chloride solution is preferably absorbed into a constant weight container through a rubber head dropper.
Placing a to-be-measured sample of the polyaluminium chloride solution in a constant-weight container, weighing, heating the container containing the to-be-measured sample of the polyaluminium chloride solution until the liquid is evaporated to dryness and the weight is constant, weighing the total mass of the container with the evaporated material, and marking the total mass as W3. In the invention, the heating temperature is 98-100 ℃, the preferred heating temperature is 99 ℃, and the preferred heating time is 10-30 min; the heating is preferably carried out in a thermostatic water bath, and the bottom of the container containing the sample to be tested in the polyaluminium chloride solution is immersed in the water bath. The method comprises the step of heating a container filled with the polyaluminium chloride solution at the temperature of 98-100 ℃, wherein the state of water is between that of liquid and gas at the temperature, the water in the solution is quickly gasified and separated, and the polyaluminium chloride cannot be decomposed and is left on the container to be a steam-dried substance. In the present invention, the weighing is preferably performed after the container with the steam-dried material left therein is placed in a dryer to be cooled to room temperature; when the heating is preferably performed by means of a thermostatic water bath, the water at the bottom of the container with the evaporated material left thereon is preferably wiped off by filter paper before being placed in the dryer. In the present invention, the constant weight is preferably continuousThe weight error of the two times of weighing is less than or equal to 0.2 mg.
To obtain the mass W of the constant-weight container1Total mass W of sample to be measured and constant weight container in polyaluminum chloride solution2And the total mass W of the container with the steam-dried material left3Then, the invention uses formula 1 to calculate the mass concentration C of the polyaluminium chloride in the sample to be measured of the polyaluminium chloride solutionPolyaluminium chloride：CPolyaluminium chloride(％)＝(W3-W1)/(W2-W1) X 100% of formula 1.
The method utilizes a physical evaporation method to detect the preparation concentration of the polyaluminium chloride in the polyaluminium chloride solution, the required time is short, and only 30-60 min of detection time is required; toxic and harmful reagents are not needed, only water vapor is generated, and no harmful waste liquid is produced, so that the method is more environment-friendly; in addition, a plurality of groups of samples can be detected simultaneously, and the container can be recycled, so that the working efficiency is further improved, and the detection cost is reduced. Moreover, the detection method provided by the invention is accurate, and compared with the common method for detecting the content of alumina in the solution by zinc oxide titration and calculating the concentration of PAC (polyaluminium chloride) in the solution, the relative error is less than 3.5 percent.
The invention also provides a method for detecting the preparation concentration of the alumina in the polyaluminium chloride solution, which comprises the following steps:
detecting the mass concentration of the polyaluminium chloride in the polyaluminium chloride solution according to the method of the technical scheme, and marking the mass concentration as CPolyaluminium chloride(ii) a The mass content of alumina in the solid polyaluminium chloride corresponding to the polyaluminium chloride solution is recorded as omegaAlumina oxideCalculating the mass concentration C of alumina in the polyaluminium chloride solution by using the formula 2Alumina oxide：
CAlumina oxide＝ωAlumina oxide×CPolyaluminium chlorideEquation 2.
In the invention, the content of alumina in the solid polyaluminium chloride corresponding to the polyaluminium chloride solution is generally a known product index, and the concentration of alumina in the polyaluminium chloride solution can be conveniently obtained according to the formula 2 after the mass concentration of the polyaluminium chloride in the polyaluminium chloride solution is detected according to the technical scheme.
The method for detecting the preparation concentration of polyaluminium chloride and alumina in the polyaluminium chloride solution provided by the present invention is described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Preparing a 15 wt% aqueous solution from solid polyaluminium chloride (PAC, the mass content of alumina is 29%) in a No. 1 medicine dissolving pool, and detecting the prepared PAC solution to check the prepared concentration of the PAC, wherein the detection process is as follows:
(1) putting the cleaned porcelain crucible into a drying oven at 105 ℃, taking out the porcelain crucible after 10min, putting the porcelain crucible into a drier, cooling the porcelain crucible to room temperature, and weighing the porcelain crucible; repeatedly drying, cooling and weighing until the weight difference between two successive times of weighing is less than or equal to 0.2mg, and recording the constant weight W of the crucible1；
(2) Sucking about 50g PAC solution into the constant weight crucible in the step (1) by using a rubber head dropper, and weighing the total mass W of the recording crucible and the PAC solution2；
(3) Placing the crucible containing the PAC solution in the step (2) on a constant-temperature water bath kettle at 99 ℃ for water bath heating until the liquid in the crucible is evaporated to dryness, wiping the steam at the outer bottom of the crucible, which is left with the evaporated matter, with filter paper for 10-30 min, placing the crucible in a dryer for cooling to room temperature, and weighing the weight of the crucible to obtain constant weight W3；
(4) Calculating PAC preparation concentration C of PAC solution by using formula 1Polyaluminium chloride：
Mass concentration of PAC preparation: cPolyaluminium chloride(％)＝(W3-W1)/(W2-W1) X 100% formula 1;
calculating the alumina mass concentration C of the PAC solution by using the formula 2Alumina oxide：
Mass concentration of alumina: cAlumina oxide＝ωAlumina oxide×CPolyaluminium chlorideEquation 2.
The concentrations of PAC and alumina in the PAC solutions tested are shown in Table 1.
Comparative example 1
The PAC formulation concentration of the PAC solution of example 1 was determined by the usual zinc oxide titration method, as follows:
weighing about 8g of PAC solution sample, dissolving with carbon dioxide-free water, fixing the volume to 250mL, transferring 10mL of the solution into a 250mL conical flask, adding 10mL of nitric acid solution, boiling for 1min, cooling to room temperature, adding 20mL of ethylene diamine tetraacetic acid disodium and 3-4 drops of thymol blue solution, neutralizing with ammonia water until the test solution turns from red to yellow, boiling for 2min, cooling, adding 10mL of acetic acid-sodium acetate buffer solution and 2 drops of xylenol orange indicator, adding 50mL of water, titrating with zinc chloride standard solution until the solution turns from light yellow to reddish, taking a blank experiment, calculating to obtain the alumina content of the PAC solution, and calculating the PAC preparation concentration of the solution according to the alumina content of solid PAC.
The concentrations of alumina and PAC in the PAC solutions obtained by titration with zinc oxide are shown in Table 1.
Example 2
A 12 wt% aqueous solution was prepared in the No. 2 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 2 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 3
A7 wt% aqueous solution is prepared in a No. 3 dissolving tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 3 dissolving tank is detected by using the detection methods of example 1 and comparative example 1 respectively to check the prepared concentration of PAC, and the detection results are listed in Table 1.
Example 4
A 12 wt% aqueous solution was prepared in the No. 4 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 4 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 5
A 9 wt% aqueous solution was prepared in the No. 5 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 5 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 6
A 9 wt% aqueous solution was prepared in the No. 6 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 6 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 7
A 9 wt% aqueous solution was prepared in the No. 7 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 7 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 8
Solid polyaluminum chloride (PAC, the mass content of alumina is 29%) is adopted to prepare a 13 wt% aqueous solution in a No. 8 dissolving tank, the PAC solution in the No. 8 dissolving tank is detected by adopting the detection methods of example 1 and comparative example 1 respectively to check the prepared concentration of PAC, and the detection results are listed in Table 1.
Example 9
A 14 wt% aqueous solution was prepared in the No. 9 dissolution tank by using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 9 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 10
A 14 wt% aqueous solution was prepared in a 10 # dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the 10 # dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 11
A 16 wt% aqueous solution was prepared in the No. 11 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 11 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 12
A 14 wt% aqueous solution was prepared in a No. 12 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 12 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 13
A 22 wt% aqueous solution was prepared in the No. 13 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 13 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 14
A 22 wt% aqueous solution was prepared in the No. 14 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 14 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 15
A 22 wt% aqueous solution was prepared in the No. 15 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 15 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 16
A 22 wt% aqueous solution was prepared in the No. 16 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 16 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 17
A 22 wt% aqueous solution was prepared in the No. 17 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 17 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 18
A 15 wt% aqueous solution was prepared in the No. 18 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 18 dissolution tank was examined by the examination methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the examination results are shown in table 1.
Example 19
A 22 wt% aqueous solution was prepared in the 19 # dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the 19 # dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 20
An 18 wt% aqueous solution was prepared in a No. 20 dissolution tank using solid polyaluminum chloride (PAC, aluminum oxide mass content of 29%), the PAC solution in the No. 20 dissolution tank was examined to recheck the preparation concentration of PAC using the examination methods of example 1 and comparative example 1, respectively, and the examination results are shown in table 1.
Example 21
An 18 wt% aqueous solution was prepared in the No. 21 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 21 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 22
An 18 wt% aqueous solution was prepared in a No. 22 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 22 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
Example 23
An 18 wt% aqueous solution was prepared in the No. 23 dissolution tank by using solid polyaluminum chloride (PAC, the mass content of alumina is 29%), the PAC solution in the No. 23 dissolution tank was tested by the testing methods of example 1 and comparative example 1, respectively, to check the prepared concentration of PAC, and the test results are shown in table 1.
TABLE 1 PAC and alumina preparation concentrations in PAC solutions obtained by testing examples 1-23 and comparative examples
The embodiment shows that the detection method provided by the invention has the advantages of short required time, no need of using toxic and harmful reagents, generation of water vapor and no output of harmful waste liquid, environmental friendliness and accuracy.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method for detecting the preparation concentration of polyaluminium chloride in a polyaluminium chloride solution is characterized by comprising the following steps:
(1) drying the container to constant weight, weighing the mass of the constant weight container, and recording as W1；
(2) Placing a sample to be detected of the polyaluminium chloride solution into the constant weight container, weighing the total mass of the sample to be detected of the polyaluminium chloride solution and the constant weight container, and recording as W2；
(3) Heating the container filled with the sample to be tested of the polyaluminium chloride solution in the step (2) until the liquid is evaporated to dryness and the weight is constant, weighing the total mass of the container with the evaporated material, and recording the total mass as W3(ii) a The heating temperature is 98-100 ℃;
(4) calculating the mass concentration C of the polyaluminium chloride in the sample to be detected of the polyaluminium chloride solution by using a formula 1Polyaluminium chloride：
CPolyaluminium chloride(％)＝(W3-W1)/(W2-W1) X 100% of formula 1.
2. The method according to claim 1, wherein the container in step (1) is a crucible; the capacity of the crucible is 100 mL.
3. The method according to claim 1 or 2, wherein the temperature for drying in the step (1) is 103-105 ℃.
4. The method according to claim 1, wherein the mass of the sample to be tested of the polyaluminum chloride solution in the step (2) is 10-50 g.
5. The method according to claim 1, wherein the heating temperature in the step (3) is 99 ℃ and the heating time is 10-30 min.
6. The method according to claim 1, wherein the constant weight in step (1) and step (3) is independently less than or equal to 0.2mg in weight error of two successive weighings.
7. The method according to claim 1 or 6, wherein the weighing in step (1) is performed after the dried container is placed in a dryer to be cooled to room temperature.
8. The method according to claim 1 or 6, wherein the weighing in step (3) is performed after the container with the steam-dried substance left therein is placed in a dryer to be cooled to room temperature.
9. A method for detecting the preparation concentration of alumina in a polyaluminium chloride solution is characterized by comprising the following steps:
detecting the mass concentration of the polyaluminium chloride in the polyaluminium chloride solution according to the method of any one of claims 1 to 8, and recording the mass concentration as CPolyaluminium chloride；
The mass content of alumina in the solid polyaluminium chloride corresponding to the polyaluminium chloride solution is recorded as omegaAlumina oxideCalculating the mass concentration C of alumina in the polyaluminium chloride solution by using the formula 2Alumina oxide：
CAlumina oxide＝ωAlumina oxide×CPolyaluminium chlorideEquation 2.
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