CN105300969B

CN105300969B - Chromium ion field fast detection method in a kind of water for eliminating reagent blank influence

Info

Publication number: CN105300969B
Application number: CN201510061588.6A
Authority: CN
Inventors: 连国军
Original assignee: Wenzhou Medical University
Current assignee: Wenzhou Medical University
Priority date: 2015-02-05
Filing date: 2015-02-05
Publication date: 2018-04-24
Anticipated expiration: 2035-02-05
Also published as: CN105300969A

Abstract

The invention discloses chromium ion field fast detection method in a kind of water for eliminating reagent blank influence, this method by the preparation of liquid-type chromium ion detection reagent, deduct reagent blank color and using transparent plastic sheet for the standard color card of support material making, detect when blank tube color addition is compareed on standard color card with sample cell again, have the advantages that method is simple, accuracy is high, easily operated；It is detected using liquid-type chromium ion detection reagent, the time required to can effectively controlling whole detection process；Method by the way that blank tube color addition to be carried out to colorimetric control with sample cell again on standard color card, the fluctuation that can effectively eliminate reagent blank are adversely affected caused by testing result accuracy, are particularly suitable for chromium ion field quick detection in water.

Description

Chromium ion field fast detection method in a kind of water for eliminating reagent blank influence

Technical field

The invention belongs to chromium ion scene in field of water quality detection, more particularly to a kind of water for eliminating reagent blank influence Quick determination method.

Background technology

Chromium is one of trace element necessary to organism, the human body but a large amount of chromium presence pollute the environment and endanger Health.Cr VI toxicity is 100 times of trivalent chromium, and chromium poisoning is primarily referred to as Cr VI.Drink by industrial wastewater containing chromium pollution Water, can cause nausea,vomiting,diarrhea, abdomen pain and ulcer etc., and human body is long-term, short term contact or suction Cr VI can all have cause The danger of cancer.In addition, exceeded Cr VI in the environment will not natural decomposition, can be accumulated in environment and human body, damage.

The detection of chromium ion is more using visible spectrophotometry, atomic absorption spectrography (AAS), inductively coupled plasma in water Body atom mass spectrography, electrochemical methods etc., these methods are both needed to taking back water sample into special laboratory, by the operation skill of specialty Art personnel, which chemically examine, to complete, and most of method also needs to expensive large-scale special instrument, it is impossible to meets quick, easy scene Testing requirements, some special when and wheres also in the presence of sampling not in time, sampling location Water quality cannot be objectively responded Situation.

Existing chromium ion Site Detection reagent is mostly the dry-type detection reagent based on colorimetric method currently on the market, The detection reagent takes a certain amount of water sample mix, dissolve with dry-type detection reagent when measuring, react a period of time after Specific color is produced, the concentration for drawing water sample test substance is directly compareed with standard color card.Such method is quick, conveniently, it is public Many participations are high, but influence of the change to measurement result of reagent blank can not be eliminated during measurement, only constant in reagent blank Just there is higher accuracy when constant.But the detection reagent of actually detected discovery, either liquid-type or dry-type, All inevitably there is a situation where that reagent blank becomes larger or diminishes in storing process.In addition, the inspection using dry-type , it is necessary to first detection reagent is fully dissolved with water sample to be measured when test agent carries out water sample detection, then with the specific pollution in water sample Thing carries out reaction and produces particular color.Since the water sample temperature that Various Seasonal, different zones gather is not quite similar, dry-type is dissolved Also it is not quite similar the time required to during detection reagent, is difficult to effectively control the time required to whole detection process, also to testing result Accuracy adversely affects.

Therefore, demand it is a kind of using liquid-type detection reagent, reagent blank can be eliminated testing result is influenced, using standard The detection method of chromium ion in the quantitative water of the direct visual colorimetric determination of colour atla, for realizing, chromium ion field quick detection seems in water It is particularly important that.

The content of the invention

The purpose of the embodiment of the present invention in a kind of water for eliminating reagent blank influence is provided chromium ion scene it is quick Detection method, to realize the live quick, Accurate Determining of chromium ion in water, overcomes the prior art when using dry-type detection reagent When being difficult to effective control detection time because of the difference of dissolution time, not deducting standard color card, the colorimetric of reagent blank because using This standard color card is directly compareed with sample cell obtain a result, testing result accuracy is made in the fluctuation that can not eliminate reagent blank The shortcomings that into adverse effect.

The present invention is achieved in that chromium ion field fast detection method in a kind of water for eliminating reagent blank influence Including：

Step 1: prepare liquid-type chromium ion detection reagent, it be containing diphenylcarbazide, phthalate anhydride, The glycine-HCI buffer solution that TritonX-100, the pH of ethylene glycol are 2.0；

Step 2: taking 7 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, 2-7 root colorimetric cylinders are mark Quasi- pipe, the chromium ion standard solution of deionized water and various concentrations is added in blank tube and standard pipe, adds step respectively Liquid-type chromium ion detection reagent described in one, reaction a period of time；

Step 3: the color as caused by colorimetric bottom of the tube shoots each tube reaction in step 2 upwards, uses mapping software After each standard pipe color is deducted blank tube color by photoshop7.0, by the color of gained and corresponding chromium ion standard solution Concentration be printed upon on water white transparency PVC plastic flitch, obtain deduct reagent blank after chromium ion standard color card；

Step 4: separately taking 2 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, the 2nd colorimetric cylinder is sample Quality control, deionized water and water sample to be measured are added in blank tube and sample cell, adds the liquid-type described in step 1 respectively Chromium ion detection reagent, reaction a period of time；

Step 5: the standard color card described in step 3 to be placed in the blank bottom of the tube in step 4, from colorimetric bottom of the tube to It is upper observation blank tube be superimposed with standard color card after color, and with sample cell color comparator, when blank tube is superimposed with standard color card When color afterwards is with sample cell solid colour, the chromium ion concentration corresponding to standard color card is read within a certain period of time, is water Chromium ion concentration in sample.

Further, in step 1, the liquid-type chromium ion detection reagent is 150mmol/L pH2.0 glycine-salt Acid buffer, the concentration of the diphenylcarbazide contained is 2-10g/L, the concentration of phthalate anhydride be 20-60g/L, The concentration of TritonX-100 is 0.02-0.08ml/L, the concentration of ethylene glycol is 10-30ml/L, and preparation method is：Weigh 2-10g Diphenylcarbazide, 20-60g phthalate anhydrides, add the stirring of 800ml 150mmol/L pH2.0 glycine-HCIs buffer solution molten Solution, adds 0.02-0.08ml TritonX-100,10-30ml ethylene glycol, uses 150mmol/L pH2.0 sweet after stirring and dissolving Propylhomoserin-hydrochloride buffer is settled to 1000ml.

Further, in step 2, the concentration of the chromium ion standard solution be respectively 0.05mg/L, 0.10mg/L, 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L, preparation method are：Precision weigh 0.1410g potassium bichromates spend from Sub- water dissolves and is settled to 500mL, obtains concentration and is the chromium ion storing solution of 100mg/L, then is stored up chromium ion with deionized water Standby liquid is diluted to the chromium ion that concentration is 0.05mg/L, 0.10mg/L, 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L Standard solution.

Further, in step 2 and step 4, the chromium ion standard solution of the addition deionized water and various concentrations Volume be 10ml.

Further, in step 2 and step 4, the volume of the addition liquid-type chromium ion detection reagent is 0.2ml.

Further, in step 2 and step 4, preferred reaction conditions are to be reacted 5-15 minutes in 5-40 DEG C of environment.

Further, in step 3, the thickness of the water white transparency PVC plastic flitch is 1-2mm.

Further, it is 5-10 minutes in step 5, in the certain time.

The chromium ion field fast detection method for eliminating reagent blank influence of the present invention has that method is simple, accuracy The advantages of high, easily operated；It is detected, can be effectively controlled needed for whole detection process using liquid-type chromium ion detection reagent Time；Method by the way that blank tube color addition to be carried out to colorimetric control with sample cell again on standard color card, can effectively eliminate Influence of the reagent blank to testing result, is particularly suitable for chromium ion field quick detection in water.

Brief description of the drawings

Fig. 1 is chromium ion field fast detection method in the water provided in an embodiment of the present invention for eliminating reagent blank influence Flow chart.

Embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, book is sent out It is bright to be further elaborated.It should be appreciated that specific embodiment described herein is only to explain this present invention, not For limiting the present invention.

Below in conjunction with the accompanying drawings and specific embodiment is further described the application principle of the present invention.

As shown in Figure 1, the present invention is achieved in that in a kind of water for eliminating reagent blank influence that chromium ion scene is fast Fast detection method includes：

S101, prepare liquid-type chromium ion detection reagent, it be containing diphenylcarbazide, phthalate anhydride, The glycine-HCI buffer solution that TritonX-100, the pH of ethylene glycol are 2.0；

S102, take 7 10ml glass colorimetric cylinders, and the 1st colorimetric cylinder of setting is blank tube, 2-7 root colorimetric cylinders are standard Pipe, the chromium ion standard solution of deionized water and various concentrations is added in blank tube and standard pipe, adds step respectively Liquid-type chromium ion detection reagent described in S101, reaction a period of time；

S103, the color as caused by colorimetric bottom of the tube shoots each tube reaction in step S102 upwards, use mapping software After each standard pipe color is deducted blank tube color by photoshop7.0, by the color of gained and corresponding chromium ion standard solution Concentration be printed upon on water white transparency PVC plastic flitch, obtain deduct reagent blank after chromium ion standard color card；

S104, separately take 2 10ml glass colorimetric cylinders, and the 1st colorimetric cylinder of setting is blank tube, the 2nd colorimetric cylinder is sample Pipe, deionized water and water sample to be measured are added in blank tube and sample cell, adds the liquid-type described in step S101 respectively Chromium ion detection reagent, reaction a period of time；

S105, the blank bottom of the tube being placed in the standard color card described in step S103 in step S104, by colorimetric bottom of the tube Look up the color after blank tube is superimposed with standard color card, and with sample cell color comparator, when blank tube and reference colour card stack When color after adding is with sample cell solid colour, the chromium ion concentration corresponding to standard color card is read within a certain period of time, is Chromium ion concentration in water sample.

Further, in step S101, the liquid-type chromium ion detection reagent for 150mmol/L pH2.0 glycine- Hydrochloride buffer, the concentration of the diphenylcarbazide contained is 2-10g/L, the concentration of phthalate anhydride be 20-60g/L, The concentration of TritonX-100 is 0.02-0.08ml/L, the concentration of ethylene glycol is 10-30ml/L, and preparation method is：Weigh 2-10g Diphenylcarbazide, 20-60g phthalate anhydrides, add the stirring of 800ml 150mmol/L pH2.0 glycine-HCIs buffer solution molten Solution, adds 0.02-0.08ml TritonX-100,10-30ml ethylene glycol, uses 150mmol/L pH2.0 sweet after stirring and dissolving Propylhomoserin-hydrochloride buffer is settled to 1000ml.

Further, in step S102, the concentration of the chromium ion standard solution be respectively 0.05mg/L, 0.10mg/L, 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L, preparation method are：Precision weigh 0.1410g potassium bichromates spend from Sub- water dissolves and is settled to 500mL, obtains concentration and is the chromium ion storing solution of 100mg/L, then is stored up chromium ion with deionized water Standby liquid is diluted to the chromium ion that concentration is 0.05mg/L, 0.10mg/L, 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L Standard solution.

Further, in step S102 and step S104, the chromium ion standard of the addition deionized water and various concentrations The volume of solution is 10ml.

Further, in step S102 and step S104, the volume of the addition liquid-type chromium ion detection reagent is 0.2ml。

Further, in step S102 and step S104, preferred reaction conditions are to be reacted 5-15 minutes in 5-40 DEG C of environment.

Further, in step S103, the thickness of the water white transparency PVC plastic flitch is 1-2mm.

Further, it is 5-10 minutes in step S105, in the certain time.

The specific embodiment of the present invention：

Embodiment 1

Step 1: weighing 2g diphenylcarbazides, 20g phthalate anhydrides, add the sweet ammonia of 800ml 150mmol/L pH2.0 Acid-hydrochloride buffer stirring and dissolving, adds 0.02ml TritonX-100,10ml ethylene glycol, is used after stirring and dissolving 150mmol/L pH2.0 glycine-HCI buffer solutions are settled to 1000ml, obtain 1000ml contain 2g/L diphenylcarbazides, 20g/L phthalate anhydrides, 0.02ml/L TritonX-100, the 150mmol/L pH2.0 glycine-HCIs of 10ml/L ethylene glycol Buffer solution is liquid-type chromium ion detection reagent；

Step 2: taking 7 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, 2-7 root colorimetric cylinders are mark Quasi- pipe, added respectively in blank tube and standard pipe 10ml deionized waters and 10ml concentration for 0.05mg/L, 0.10mg/L, The chromium ion standard solution of 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L, add the liquid-type described in step 1 Chromium ion detection reagent 0.2ml, reacts 15 minutes in 5 DEG C of environment；

Step 3: the color as caused by colorimetric bottom of the tube shoots each tube reaction in step 2 upwards, uses mapping software After each standard pipe color is deducted blank tube color by photoshop7.0, by the color of gained and corresponding chromium ion standard solution Concentration be printed upon thickness be 1mm water white transparency PVC plastic flitch on, obtain deduct reagent blank after each concentration chromium ion mark Quasi- colour atla；

Step 4: separately taking 2 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, the 2nd colorimetric cylinder is sample Quality control, 10ml deionized waters and 10ml water samples to be measured are added in blank tube and sample cell, is added described in step 1 respectively Liquid-type chromium ion detection reagent, reacted 15 minutes in 5 DEG C of environment；

Step 5: the standard color card described in step 3 to be placed in the blank bottom of the tube in step 4, from colorimetric bottom of the tube to It is upper observation blank tube be superimposed with standard color card after color, and with sample cell color comparator, when both solid colours, at 5 points The chromium ion concentration corresponding to standard color card is read in clock, show that chromium ion concentration is 0.05mg/L in water sample.

The chromium ion concentration of water sample described in the present embodiment step 4 is detected with national standard method atomic absorption method, As a result it is 0.047mg/L, it can be seen that the present embodiment the method has consistent well with the testing result of atomic absorption method Property.

Embodiment 2

Step 1: weighing 6g diphenylcarbazides, 40g phthalate anhydrides, add the sweet ammonia of 800ml 150mmol/L pH2.0 Acid-hydrochloride buffer stirring and dissolving, adds 0.05ml TritonX-100,20ml ethylene glycol, is used after stirring and dissolving 150mmol/L pH2.0 glycine-HCI buffer solutions are settled to 1000ml, obtain 1000ml contain 6g/L diphenylcarbazides, 40g/L phthalate anhydrides, 0.05ml/L TritonX-100, the 150mmol/L pH2.0 glycine-HCIs of 20ml/L ethylene glycol Buffer solution is liquid-type chromium ion detection reagent；

Step 2: taking 7 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, 2-7 root colorimetric cylinders are mark Quasi- pipe, added respectively in blank tube and standard pipe 10ml deionized waters and 10ml concentration for 0.05mg/L, 0.10mg/L, The chromium ion standard solution of 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L, add the liquid-type described in step 1 Chromium ion detection reagent 0.2ml, reacts 10 minutes in 20 DEG C of environment；

Step 3: the color as caused by colorimetric bottom of the tube shoots each tube reaction in step 2 upwards, uses mapping software After each standard pipe color is deducted blank tube color by photoshop7.0, by the color of gained and corresponding chromium ion standard solution Concentration be printed upon thickness be 1.5mm water white transparency PVC plastic flitch on, obtain deduct reagent blank after each concentration chromium ion Standard color card；

Step 4: separately taking 2 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, the 2nd colorimetric cylinder is sample Quality control, 10ml deionized waters and 10ml water samples to be measured are added in blank tube and sample cell, is added described in step 1 respectively Liquid-type chromium ion detection reagent, reacted 10 minutes in 20 DEG C of environment；

Step 5: the standard color card described in step 3 to be placed in the blank bottom of the tube in step 4, from colorimetric bottom of the tube to It is upper observation blank tube be superimposed with standard color card after color, and with sample cell color comparator, when both solid colours, 7.5 The chromium ion concentration corresponding to standard color card is read in minute, show that chromium ion concentration is 0.40mg/L in water sample.

The chromium ion concentration of water sample described in the present embodiment step 4 is detected with national standard method atomic absorption method, As a result it is 0.41mg/L, it can be seen that the method for the embodiment of the present invention and the testing result of atomic absorption method have good one Cause property.

Embodiment 3

Step 1: weighing 10g diphenylcarbazides, 60g phthalate anhydrides, add the sweet ammonia of 800ml 150mmol/L pH2.0 Acid-hydrochloride buffer stirring and dissolving, adds 0.08ml TritonX-100,30ml ethylene glycol, is used after stirring and dissolving 150mmol/L pH2.0 glycine-HCI buffer solutions are settled to 1000ml, obtain 1000ml contain 10g/L diphenylcarbazides, 60g/L phthalate anhydrides, 0.08ml/L TritonX-100, the 150mmol/L pH2.0 glycine-HCIs of 30ml/L ethylene glycol Buffer solution is liquid-type chromium ion detection reagent；

Step 2: taking 7 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, 2-7 root colorimetric cylinders are mark Quasi- pipe, added respectively in blank tube and standard pipe 10ml deionized waters and 10ml concentration for 0.05mg/L, 0.10mg/L, The chromium ion standard solution of 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L, add the liquid-type described in step 1 Chromium ion detection reagent 0.2ml, reacts 5 minutes in 40 DEG C of environment；

Step 3: the color as caused by colorimetric bottom of the tube shoots each tube reaction in step 2 upwards, uses mapping software After each standard pipe color is deducted blank tube color by photoshop7.0, by the color of gained and corresponding chromium ion standard solution Concentration be printed upon thickness be 2mm water white transparency PVC plastic flitch on, obtain deduct reagent blank after each concentration chromium ion mark Quasi- colour atla；

Step 4: separately taking 2 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, the 2nd colorimetric cylinder is sample Quality control, 10ml deionized waters and 10ml water samples to be measured are added in blank tube and sample cell, is added described in step 1 respectively Liquid-type chromium ion detection reagent, reacted 5 minutes in 40 DEG C of environment；

Step 5: the standard color card described in step 3 to be placed in the blank bottom of the tube in step 4, from colorimetric bottom of the tube to It is upper observation blank tube be superimposed with standard color card after color, and with sample cell color comparator, when both solid colours, at 10 points The chromium ion concentration corresponding to standard color card is read in clock, show that chromium ion concentration is 0.80mg/L in water sample.

The chromium ion concentration of water sample described in the present embodiment step 4 is detected with national standard method atomic absorption method, As a result it is 0.77mg/L, it can be seen that the present embodiment the method and the testing result of atomic absorption method have good uniformity.

Embodiment 4

In order to further prove the creativeness of the present invention, the present invention has done following contrast test, has investigated the change of reagent blank Change the influence to measurement result accuracy.Method as described in 1 step 1 of this law embodiment prepares the detection examination of liquid-type chromium ion Agent is test group, not deduct reagent blank, use the detection reagent of standard color card direct color comparison as control group, by two group reagents 4 DEG C of refrigerators are put respectively and 37 water-baths store 7 days, and have been with aas determination chromium ion concentration to same portion The water sample of 0.05mg/L is measured, while replaces water sample to carry out reagent blank test with deionized water, with 721 spectrophotometers Reagent blank value is recorded, cuvette optical path is 1cm during test, and test wavelength 545nm, reference solution is deionized water, as a result It is shown in Table 1.

Table 1

As it can be seen from table 1 under identical experiment condition, with the gradual increase of reagent blank, the measure of test group As a result remain unchanged, but the measurement result of control group substantially becomes larger, and shows that method of the present invention can effectively remove reagent sky Influence of the white change to chromium ion test result.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.

Claims

1. chromium ion field fast detection method in a kind of water for eliminating reagent blank influence, it is characterised in that described can Eliminating chromium ion field fast detection method in the water that reagent blank influences includes：

Step 1: preparing liquid-type chromium ion detection reagent, chromium ion detection reagent contains diphenylcarbazide, phthalic acid Glycine-hydrochloride buffer that acid anhydride, TritonX-100, the pH of ethylene glycol are 2.0；

Step 2: taking 7 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, 2-7 root colorimetric cylinders are mark Quasi- pipe, the chromium ion standard solution of deionized water and various concentrations is added in blank tube and standard pipe, adds step respectively One liquid-type chromium ion detection reagent, is reacted；

Step 3: the color as caused by colorimetric bottom of the tube shoots each tube reaction in step 2 upwards, uses mapping software

After each standard pipe color is deducted blank tube color by photoshop7.0, by the color of gained and corresponding chromium ion mark The concentration of quasi- solution is printed upon on water white transparency PVC plastic plates, obtains deducting the chromium ion standard color card after reagent blank；

Step 4: separately taking 2 10ml glass colorimetric cylinders, the 1st colorimetric cylinder of setting is blank tube, the 2nd colorimetric cylinder is sample Quality control, adds deionized water and water sample to be measured in blank tube and sample cell respectively, add liquid-type chromium in step 1 from Sub- detection reagent, is reacted；

Step 5: the standard color card described in step 3 to be placed in the blank bottom of the tube in step 4, seen upwards by colorimetric bottom of the tube Examine the color after blank tube is superimposed with standard color card, and with sample cell color comparator, after blank tube is superimposed with standard color card When color is with sample cell solid colour, the chromium ion concentration corresponding to standard color card is read, is chromium ion concentration in water sample.

2. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, its feature It is, in step 1, the liquid-type chromium ion detection reagent is 150mmol/L pH2.0 glycine-hydrochloride buffer, The concentration of the diphenylcarbazide contained is 2-10g/L, the concentration of phthalate anhydride is the dense of 20-60g/L, TritonX-100 The concentration spent for 0.02-0.08ml/L, ethylene glycol is 10-30ml/L.

3. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 2, its

It is characterized in that, glycine-hydrochloride buffer liquid making method is：Weigh 2-10g diphenylcarbazides, 20-60g benzene two Formic anhydride, adds 800ml 150mmol/L pH2.0 glycine-hydrochloride buffer stirring and dissolving, adds 0.02- 0.08mlTritonX-100,10-30ml ethylene glycol, use 150mmol/L pH2.0 glycine-hydrochloride buffer after stirring and dissolving Liquid is settled to 1000ml.

4. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, it is special

Sign is, in step 2, the concentration of the chromium ion standard solution is respectively 0.05mg/L, 0.10mg/L, 0.20mg/ L、0.40mg/L、0.60mg/L、0.80mg/L。

5. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 4, its feature It is, chromium ion standard solution preparation method is：Precision weighs 0.1410g potassium bichromates deionized water dissolving and is settled to 500mL, obtains concentration and is the chromium ion storing solution of 100mg/L, then chromium ion storing solution is diluted to concentration with deionized water and is The chromium ion standard solution of 0.05mg/L, 0.10mg/L, 0.20mg/L, 0.40mg/L, 0.60mg/L, 0.80mg/L.

6. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, its feature It is, in step 2, the volume of the chromium ion standard solution of the addition deionized water and various concentrations is 10ml, step In four, the volume of the addition deionized water is 10ml.

7. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, its feature It is, in step 2 and step 4, the volume of the addition liquid-type chromium ion detection reagent is 0.2ml.

8. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, its feature It is, in step 2 and step 4, reaction condition is to be reacted 5-15 minutes in 5-40 DEG C of environment.

9. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, its feature It is, in step 3, the thickness of the water white transparency PVC plastic plates is 1-2mm.

10. chromium ion field fast detection method in the water for eliminating reagent blank influence as described in claim 1, it is special Sign is, in step 5, the chromium ion concentration corresponding to standard color card is read in reaction after 5-10 minutes.