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Method for rapid detection of mercury content in water

A technology for detecting water and content, applied in the field of chemical analysis, can solve the problems such as no reports of mercury content detection, trouble, complexity, etc., and achieve the effects of high degree of automation, broad application prospects, high sensitivity and accuracy

Inactive Publication Date: 2015-01-21
SHANGHAI WEIZHENG TEST TECH
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Problems solved by technology

This method is more complicated to operate, needs to add sample and tin protochloride reducing agent in the reaction flask at every turn during measurement, and the reading will keep an eye on the display, write down the highest value, the mercury after the reaction is absorbed by the potassium permanganate solution, Therefore, it is very troublesome to change the absorbent frequently.
[0008] Hydride generation atomic absorption spectrometry is a new trace analysis technique, which has the characteristics of high sensitivity, less interference of coexisting elements, simple and fast method, etc. However, there are no reports on the application of this method to the detection of mercury content in water

Method used

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  • Method for rapid detection of mercury content in water

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Embodiment 1

[0024] 1. Preparation of water samples

[0025] 1.1 Instruments and materials

[0026] Distilled or deionized water; Mixing container, high-density polyethylene bottle with a capacity of 2L and a sealing stopper;

[0027] Alum (analytical pure);

[0028] 1.2 Clarification steps

[0029] Measure 1L of water sample, place it in a mixing container for clarification, add a small amount of alum to accelerate the precipitation and coagulation of sulfide;

[0030] Then draw the supernatant, and immediately measure the pH value of the supernatant, or properly protect the storage supernatant according to the requirements of the specified analysis method.

[0031] 2. Digestion of liquid samples to be tested

[0032] Using the sulfuric acid-nitric acid-potassium permanganate digestion method, take a certain amount of supernatant in a 150mL Erlenmeyer flask, add sulfuric acid-nitric acid mixed acid and potassium permanganate solution, insert the funnel, place it on an electric heating...

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Abstract

The invention discloses a method for rapid detection of mercury content in water. The method includes the following steps: a) preparing a supernatant by an alum precipitation method to prepare a liquid sample to be tested; b) digesting the liquid sample by a sulfuric acid-nitric acid-potassium permanganate digestion method, completely transforming mercury ions into divalent mercury, and reducing excessive oxidant; c) reducing the divalent mercury in the liquid sample to be tested into metallic mercury by using boron hydride; and d) detecting the mercury content in the liquid sample by using a hydride atomic absorption spectrophotometry. The invention provides a determination method with high degree of automation, and can rapidly determine mercury content in a variety of sample sources; and compared with the conventional method, the method is more labor-saving and time-saving in operation, and has high accuracy and high sensitivity.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a method for rapidly detecting mercury content in water. Background technique [0002] Mercury is an accumulative toxic element. After entering the human body, it accumulates in the central nervous system, liver and kidneys, causing damage and poisoning to related organs. Mercury poisoning can be divided into acute and chronic. Inhalation of large doses of mercury vapor or ingestion of mercury compounds can cause acute poisoning, which can be life-threatening in severe cases. This kind of acute poisoning is rare nowadays, and mainly occurs in productive poisoning such as mercury mining, amalgam smelting and other production workers. In fact, what is more common and more threatening to the general public is various unknown chronic mercury poisoning from the surrounding environment. [0003] Because mercury is not only in the form of metal in nature, but also widely ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 包志祥
Owner SHANGHAI WEIZHENG TEST TECH
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