KR920003043B1 - Mehtod for detecting a hardness element - Google Patents

Abstract

The method detects constituents of hard water by use of a chemical reagent. The hard water constituent, i.e. Ca+2, Mg+2, included in sea water used as cooling water in a high pressure boil, causes scale or sludge in the boiler pipes. This method prevents a large-scale boiler accident from occuring by simply detecting the sea water pollution within the boiler. The chemical reagent (100 W%) below 64.6 deg.C is composed of methyl alcohol (48.5 W%), tri ethanol amine (50 W%), sodium cyanide (1.2-1.3 W%) and rio chrome black (0.2-0.3 W%). The constituent is detected as colour by mixing the chemical reagent and the test water by the ratio of 3:1,000.

Description

Hardness component detection method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hardness component detection method capable of detecting the hardness components of various types of water and various kinds of water used in a turbine generator condenser of a high pressure boiler and the like with a single reagent.

In general, water resources are used for drinking water or industrial water, which can be classified into hard water and soft water according to the inherent properties of the water itself. It is very important to quickly and accurately distinguish between licensed and soft water, and it is well known that the use of hard water is extremely limited among boiler water used in various boilers, among various industrial waters.

In general, the boiler water is divided into water supply, plural water and water. In the various boiler waters used here, the pure water produced in the pure water chamber is usually supplied to the boiler and circulated in the boiler. However, in particular, the turbine generator condenser of a high pressure boiler uses a lot of sea water as cooling water. The seawater as the cooling water flows through a cooling water pipe consisting of about 2000 15 ^A copper pipes in a turbine generator condenser (steam condenser) of a high pressure boiler, and serves to condense steam. When a pin hole occurs, the boiler water is contaminated by the leak of sea water, which causes corrosion of the boiler very rapidly under high temperature and high pressure, and causes the formation of scale and sludge. It causes huge obstacles to the equipment. Ions include a direct obstacle to the boiler, such as the hardness components of Ca ^+2, Mg ^+2, and SiO _2, Cl, usually in the water ^- there is such, the hardness of the composition Ca ^+2, Mg ⁺² are the scaling by proceeding at the best adhesion and sludge sikimyeo results in a thermal conductivity decrease in the boiler and which, due to import the local rupture of the boiler accelerate the corrosion, a chlorine ion Cl ^- will cause extremely rapid erosion, SiO ₂ ingredient is a scaling tube interior and Attached to the blade of the turbine (Blade) is the cause of the closing of the evaporator tube and the output of the turbine. Thus, since the seawater contains a large amount of hardness components, it is possible to confirm whether seawater contamination has occurred in the boiler only by detecting the hardness components. Therefore, it is necessary to determine whether the seawater is contaminated in the boiler in a faster manner and to prevent a large boiler accident in advance.

In the conventional analysis of the hardness component, 100 ml of water to be tested, that is, 100 ml of test water, was collected, and 0.08-0.12 ml of 10% potassium cyanide (KCN) solution, 0.8-1.2 ml of buffer solution having a pH of 10, and eryochrome It was generated by adding 0.04-0.06 ml of Erio chrome Black T. indicator and titrating with M / 100-EDTA standard solution to detect hardness components. However, the pH 10 buffer solution of the four prepared drugs is a liquid containing a large amount of ammonium hydride (Amonium Hydrate; NH ₄ OH), so that when the reagents stand, mix and dissolve As the concentration of chromium black T. was diluted, it was difficult to judge the degree of color development, and the four drugs could not be made into a single drug because the pH adjustment and the interference ion concealment effect were weak. Therefore, at the moment when the hardness component was to be detected, the preparation of the drug as an inspection preparation was excessively required, and the preparation time was excessively excessive. Also, the hardness component should be detected by injecting and developing various types of prepared chemicals in order. Therefore, it is not only inconvenient to use, but also has a problem in that it is difficult to measure water resources in a certain place, ie a place other than a laboratory, for handling four kinds of medicines. In addition, there was a problem due to the time delay in the round trip distance, that is, when the inspection was collected, and in particular, when the reagent was prepared due to the large amount of ammonium hydrate (MH ₄ OH) contained in the buffer solution of pH 10 or the hardness component. Ammonia gas, an induction gas, in the detection process Was caused by additional measures are needed because the cause of serious diseases of the human respiratory system to prevent this mechanism, as well as to reduce the damage. In addition, when the titration is performed with the M / 100-EDTA standard solution, there are many problems such that the content of the hardness component is higher than the actual content due to the action of the interfering ions.

Therefore, the object of the present invention is to solve the problems of the conventional detection drugs and the detection method as described above as a single drug can be used quickly and immediately within 10 seconds in the field outside the laboratory, while no generation of toxic gases and interference The present invention provides a method for preparing a hardness component detection reagent for water and a method for detecting hardness components using the detection reagent which can further enhance the accuracy of the measurement by concealing the action of the ions.

In order to realize the above object, the following four raw material reagents were used as raw materials of the single reagent of the present invention.

Erio chrome black T. (C ₂₀ H ₁₂ N ₃ NaO ₇ S)

Sodium Cyanide (NaCN)

Methyl Alcohol (CH ₃ OH)

Tri Ethanol Amine ((CH ₂ CH ₂ OH) ₃ N)

The present invention is prepared according to the previous drug concentration using the four types of reagents, methyl alcohol (CH ₃ OH) instead of pure water (H ₂ O) as a solvent in order to prevent the deterioration of the drug and to increase the solubility do. Methyl alcohol 48.5W%, triethinolamine 50W%, sodium cyanide 1.2-1.3W%, erythrochrome black tea against 100W% of the total amount of a single drug for hardness component detection. It is manufactured at the ratio of 0.2-0.3W%, and when the hardness component is detected, the ratio of the inspection and the single drug input is 1000: 3 to maintain the same real concentration as the conventional reagent. In addition, triethanol amine is a reagent that serves to conceal other ions other than the hardness components Ca ⁺² and Mg ⁺² , where the reason for diluting the reagent in a ratio of about 1: 1 with methyl alcohol (CH ₃ OH) is examined. It is for forming a viscosity of a convenient degree when dropping the chemical agent for hardness component detection of the present invention.

Process and method for preparing the single reagent is as follows.

First, 5 g of sodium cyanide (NaCN) and eriochrome black tea. To dissolve the indicator 1g of methyl alcohol (CH ₃ OH) of about 190ml, this time, scattering of the reagent dissolved in the boiling point temperature of less than 64.6 ℃ of methyl alcohol (CH ₃ OH) in order to prevent (by boiling phenomenon to fly into the air) Operate Thereafter, 200 ml of triethanolamine was diluted with the resultant solution, and then methyl alcohol was added in a total amount of 400 ml to complete the hardness component detection reagent of the present invention as a single drug.

Next, a method for detecting hardness components using the present invention single reagent will be described.

First, the determination of seawater leakage and the presence or absence of hardness component detection of a high pressure boiler or the like depends on the color development when a single reagent 0.25-0.35ml according to the present invention is taken by taking 100 ml of the inspection. In this case, when the color is red, the hardness component is present in the inspection, and when it is blue, it is determined that there is no hardness component. Representation of the above in the reaction scheme is as follows.

Then, in order to calculate the precise content of the hardness component, in the presence or absence of the hardness component in the determination test for the presence of the hardness component, that is, when the red color is developed, the inspection is performed by titrating with the M / 100-EDTA standard solution and red to blue. It can be calculated by measuring the amount of the administered M / 100-EDTA standard solution until the color conversion to a ml unit, the formula used for the calculation is as follows.

Secondly, when the reagent for detecting the hardness component is added to water containing the hardness component, the color develops red. When titrated with M / 100-EDTA standard solution, the solution is changed to blue by the last drop of M / 100-EDTA standard solution. With the end point as the end point, the content of the hardness component can be calculated according to the above formula with the amount of M / 100-EDTA standard solution used, and the reaction formula is as follows.

Putting the experimental results according to the present invention into the above formula, the results of calculating the hardness component content are summarized in <Table 1>. At this time, the aliquot of the standard hardness solution, that is, the inspection amount is 100 ml and the M / 100-EDTA Factor is 1.1209.

TABLE 1

As described above, the hardness component detection reagent of the present invention is an easy-to-use and easy-to-use hardness component detection reagent produced by integrating the conventional four limb reagents into a single reagent. Since it is possible to reduce unnecessary time such as preparing a chemical before detecting a component, rapid detection is possible. In the past, even if the experiment was simple, all experiments were possible only in a place equipped with constant conditions and facilities, such as a laboratory. According to the invention, a simple discrimination test such as seawater and hardness component contamination at multiple times of a high-pressure boiler turbine generator in a power plant can be directly and quickly conducted at any outdoor site regardless of time and place. As a result, the inspection does not need to be collected and transported to the laboratory, thereby reducing the time lag in the round trip distance. Also, since the pH automatic adjustment function is used, the ammonia gas, which is a toxic gas, does not need to use the pH 10 buffer solution used for pH adjustment. is not generated was not necessary to worry about the human respiratory disease, hardness components Ca ^+2, Mg ⁺² pH range for each because it is ^{pH 7.5-12.5, pH 9.5-10.5 Ca +2 +} Mg ⁺² content It can be seen that the optimum pH is in the range of 0.5-10.5, and the boiler water quality management standard value (pH 8.7-10.8 of the water supply and the plurality of pH 8.5-9.5 and irrigation water) in the pH range state, the hardness component by the input of 0.25-0.35ml of the present single reagent. It keeps enough within pH range of 9.5-10.5, so that the conditions for accurate content calculation of hardness components can be prepared. Compensation that the content of the component was higher than the actual value, because the reagent of the present invention has the interference ion concealment effect during titration, the interfering ions Fe ⁺³ , Al ⁺³ , Cu ⁺² , Hg ⁺² , Mn ⁺² , Ni ^{+ 2} , Co ⁺² , Zn ⁺² , Pb ^+2, etc., by concealing the interfering action, such as accurate detection is possible, the present invention can achieve a color development effect, pH adjustment effect, interference ion concealment effect at the same time, so as to quickly and accurately There is an advantage that detection can be performed.

Claims (1)

Methyl alcohol 48.5 W%, triethanol amine ((CH ₂ CH ₂ OH) ₃ N) 50 W%, sodium cyanide (NaCN) 1.2-1.3 W%, erythrochrome black tea (C ₂ OH ₁₂ N ₃ NaO ₇ S) Dissolve at a ratio of 0.2-0.3W%, and detect the hardness component in the volume ratio of 3: 1000. Hardness component detection method characterized by detecting with a reagent.