Preparation and use methods of rapid detection agent for measuring trace mercury in water

Abstract

The invention relates to preparation and use methods of a rapid detection agent for measuring trace mercury in water. The detection agent is composed of a mercury detection agent I, a mercury detection agent II and a mercury detection agent III which are respectively prepared from cadion, stannous sulfate, sulfamic acid, potassium iodate, borax, triton X-100, and the like. Firstly, a multifunctional sample treatment instrument and the mercury detection agents I and II are used for carrying out gas stripping pretreatment on trace mercury in a water sample, and then, the mercury detection agent III is directly added into the absorption liquid after pretreatment for carrying out color development reaction, so that measurement can be carried out by utilizing a colorimeter or a spectrophotometer. The detecting instrument used in the invention is simple and portable and is easy to operate, and mercury detection powder is stable in quality, can be stored for a long term and is convenient to transport and carry. According to the method, the mercury detection limit is 0.002mg / L, the whole detection process is less than 20 minutes, and the method is especially suitable for field and site rapid detection of trace mercury in surface water and industrial wastewater.

Description

technical field [0001] The invention relates to a method for preparing and using a rapid detection agent for determining trace mercury in water, and belongs to the technical field of environmental monitoring. Background technique [0002] Mercury and its derivatives, organic mercury, are an important class of toxic and harmful environmental pollutants. They have the characteristics of persistence, easy migration, high bioaccumulation and high biotoxicity. They can exist in the atmosphere and food chain for a long time, and can be far away. distance migration. It has been listed as a global pollutant by the United Nations Environment Program, and it is the only chemical substance that has an impact on a global scale except for greenhouse gases. It has become one of the environmental pollutants of global concern. Mercury can cause damage to the brain, nerves, kidneys and liver of the human body, and even cause coma and death. Mercury emissions come from natural sources and m...

AI Technical Summary

Problems solved by technology

The chromogenic reaction method has problems such as large interference, poor selectivity, and insufficient sensitivity, and often cannot meet the requirements of rapid detection of trace mercury in the field or in the field, while the electrochemical method often has serious interference from coexisting metal ions, poor data reproducibility, and electrode instability. and troublesome maintenance

[0004] Regarding field and on-site detection, Wei Yongge et al. developed a mercury ion kit (Wei Yongge, Chen Kun, Zhang Haochen, etc., a kit for colorimetric detection of mercury ions in sewage and its detection method, CN105548152A, 2016), the sewage samples were first passed through The acidic potassium permanganate solution is digested and then neutralized, and then mixed evenly with the methanol solution of organically modified single-deficient hexamolybdic acid, and then interacts specifically with mercury ions, causing the color of the solution to change, and is colorimetric with the mercury in the kit Carry out color comparison with the card to detect the mercury content in the sample. This method is simple, high specificity, fast detection speed and high sensitivity, but the quantitative effect is poor, the background interference is serious, and the detection cost is high.