Method for measuring trace amount of bromate in water

Abstract

The invention relates to a method for measuring trace amount of bromate in water, and particularly relates to a method which utilizes victoria brilliant blue BO (VPBBO) containing an emulsifying agent OP as a color-developing agent and utilizes a spectrophotometric method to measure trace amount of bromate in water. The method comprises the following steps of successively adding 25.0mL of a water sample to be measured, 3.0mL of 0.1mol.L-1 of hydrochloric acid solution and 2.0mL of 0.05 mol.L-1 of solution KI, successively adding 5.0mL of phosphoric acid-sodium dihydrogen phosphate buffer solution with the pH value being 1.9+ / -0.1 and 5.0mL of 2.0*10-4mol.L-1 victoria blue BO containing 0.4g.L-1 of emulsifying agent OP after 5min; carrying out constant volume by utilizing distilled water, shaking up, using a color comparison dish being 1cm after 2min, adopting a reagent blank as a reference, and measuring the absorbance of a solution at 580nm wavelength; and calculating the concentration of the bromate ion by using a regression equation according to a standard work curve, namely A=1.40*10-3C (mu g.L-1)-7.11*1.0-4 (r is equal to 0.9995, the linear range is 0-260 mug.L, A is optical density, and C is concentration of bromate ion). The method provided by the invention has the advantages that the sensitivity is high, the result is exact, the operation is simple and convenient, and the cost is low.

Description

technical field [0001] The present invention relates to a method for the determination of trace bromate in water, in particular to a spectrophotometric method using Victoria Brilliant Blue BO (VPB-BO) (C.I.42595 molecular weight 513.5) containing emulsifier OP as a color developer. Method for trace bromate in water. Background technique [0002] Chlorine disinfection is a widely used tap water disinfection technology in my country, but this method will produce a variety of by-products, such as chloroform and toxic chloroacetic acid, which will pose a potential threat to human health. Therefore, people gradually turned to other disinfection methods. Ozone was used as a disinfectant at the beginning of this century. It is one of the most effective disinfectants among known chemical disinfectants, and it has a good removal effect on various microorganisms in water. Ozone disinfection method has many advantages. It avoids the residual chlorine and by-products produced by chlor...

AI Technical Summary

Problems solved by technology

The accuracy and sensitivity of the titration method are low; the ICP-MS method is susceptible to bromoacetic acid interference, and the detection accuracy is not high; the ion chromatography method requires a large-capacity separation column, and the detection cost is high. In addition, it is also susceptible to inorganic chloride ions in water. interference, and the detection accuracy is not high; the apparent molar absorptivity of the chromogenic agent used in the traditional spectrophotometric method is low, resulting in low detection sensitivity, and cannot accurately quantitatively determine trace bromate in drinking water, so the application of these methods is limited. subject to certain restrictions

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