Method for detecting trace mercury and cadmium in water through ICP (inductively coupled plasma) extraction

Abstract

The invention provides a method for detecting trace mercury and cadmium in water through ICP (inductively coupled plasma) extraction. The method comprises steps as follows: S1: a round-bottom centrifugal plastic pipe is prepared, and 10 mL of a sample solution with the pH being 7.0 is added to the round-bottom centrifugal plastic pipe; two drops of a neutral red indicating liquid are dropped, the solution is adjusted to be yellow with a color toner, a complexing agent and the sample solution are added and mixed sufficiently to form a hydrophobic ionic associate, and pH of the mixed solution is adjusted to 5.0 with a buffer solution after the mixture is uniformly shaken and left to stand; S2: 1 mL of an ammonium pyrrolidine dithiocarbamate solution and 1 mL of a Triton X-114 solution with the volume percentage being 20% are continuously added to the sample solution obtained in S2. In the technological procedure, technical features such as color adjustment, centrifugal shaking, temperature control and the like are added, the detection process can be ensured to be more accurate, the accuracy is improved, and the method is easy to operate, facilitates actual treatment, cannot cause heavier pollution and is favorable for popularization and application.

Description

[technical field] [0001] The invention relates to the technical field of trace element detection, in particular to an ICP extraction method for detecting trace amounts of mercury and cadmium in water with strong enrichment ability, simple operation and simultaneous detection of multiple elements. [Background technique] [0002] Heavy metal pollution has always been a concern after the rise of industry. Generally, the toxicity range of heavy metals is about 1-10mg / L, and the concentration range of toxic metals such as mercury and cadmium is 0.01- Between 0.001mg / L. There are many sources of mercury and cadmium. For example, waste batteries contain heavy metal toxic substances such as mercury and cadmium. If the waste batteries are landfilled, the shell of the battery will be corroded and perforated over time, causing harmful substances to enter the soil and water. Pollution to the environment; factories do not discharge sewage according to the indicators, resulting in excess...

AI Technical Summary

Problems solved by technology

[0003] The pre-treatment and detection of heavy metal mercury and cadmium, currently mostly adopt the traditional dithizone spectrophotometry and GB / T7468-1987, GB / T 7475-1987 water quality determination and the cold atomic absorption spectrophotometry mainly used in relevant standards, Atomic absorption method and atomic fluorescence method, etc. Some of the standard methods can no longer meet the requirements of trace analysis in terms of sensitivity, precision and accuracy. However, unfortunately, this method needs to use a large amount of organic solvent (chloroform) for liquid-liquid extraction to achieve enrichment and separation, which not only does not show selectivity , time-consuming, waste of reagents, and the widespread use of chloroform will also cause certain harm and impact on the environment and human body

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