A method for the determination of trace thallium in water

Abstract

The invention discloses a method for measuring trace thallium in water. The method includes following steps: (1), preparing a thallium standard solution; (2), demarcating a sodium EDTA standard titration solution; (3), setting a sampling amount; (4), gathering foamed plastic of a sample; (5), analyzing the sample; (6), calculating thallium content in the sample. Polyurethane foam is adopted to separate gathered thallium, desorption is realized through water bath, and an automatic photometric titrator is utilized to measure trace thallium in the water. The method is simple, quick, high in accuracy, low in instrument investment and using cost, low in detection limit and capable of meeting detection work and study needs of people.

Description

technical field [0001] The invention relates to a simple method for measuring trace thallium in water, in particular to a method for measuring trace thallium in water. Background technique [0002] Thallium (Thallium), as a heavy metal element, is highly toxic and has accumulation properties. It is a strong neurotoxicant. Under normal circumstances, the minimum lethal dose for a 70kg adult is 50-80mg, and the maximum permissible daily intake of thallium is 2mg. If the thallium content in the environmental medium approaches or exceeds its threshold, it may cause harm to human health and the environment. Therefore, thallium is one of the important indicators for environmental monitoring. At present, the more common detection methods or means include inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma-atomic emission spectrometry, graphite furnace atomic absorption spectrometry, etc. Due to the use of large-scale instruments and equipment, these d...

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Problems solved by technology

Therefore, thallium is one of the important indicators for environmental monitoring. At present, the more common detection methods or means include inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma-atomic emission spectrometry, graphite furnace atomic absorption spectrometry, etc. Due to the use of large-scale instruments and equipment, these detection methods can obtain lower detection limits and are suitable for micro and trace analysis of thallium. The disadvantages are that the investment and use costs of instruments and equipment are high, and their popularization and application are limited.

Traditional titration analysis is generally used for constant analysis, not suitable for micro and trace analysis. Titration analysis of thallium also has EDTA titration method, but it is only suitable for the determination of high-concentration thallium solutions. The suitable determination concentration is: greater than 4mg / ml

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