Method for extracting soil heavy metal ion

Abstract

The invention relates to a method for extracting a soil heavy metal ion. The method comprises the following steps: preparing an extraction salt solution with the pH value of 4.5, mixing collected soil, carrying out high-temperature forced air drying, grinding dried soil with a soil grinder, weighing part of ground soil, adding a certain amount of an extracting agent, carrying out heating and ultrasound treatment in an ultrasonic instrument, filtering impurities in the soil by adopting a two-step method, carrying out preliminary filtration with a large-aperture filter, then carrying out secondary filtration with a small-aperture rapid filter, removing the tiny impurities in the soil to obtain sample liquid to be tested. By adopting the method, the conventional operation procedure can be simplified, and the extracting efficiency of the heavy metal ion can be improved.

Description

technical field [0001] The invention relates to soil detection technology, in particular to a pretreatment method for detection of soil heavy metal ions. Background technique [0002] Due to the lack of attention paid to environmental protection in the process of industrial and agricultural production development in my country, environmental pollution has become increasingly serious, especially the environment of agricultural product production areas (such as farmland soil and irrigation water), which are closely related to people's lives, suffers the most serious damage from heavy metal pollution. Heavy metal pollutants can cause physiological dysfunction and nutritional imbalance in plants. They have little mobility in the soil and cannot be degraded in nature. After entering the human body through the food chain, they are potentially harmful. Our country has a vast land area, and we want to establish an information record and information traceability system in the process...

AI Technical Summary

Problems solved by technology

Our country has a vast land area, and we want to establish an information record and information traceability system in the process of agricultural product production, processing, storage, sales, and consumption, that is, the process tracking from "farm to table" or the source traceability technology from "table to farmland" , it is necessary to solve the problems of long time-consuming, complicated operation and environmental pollution in the pre-treatment process of the portable heavy metal detection instrument.

[0003] The traditional treatment method has the following problems: (1) The operation is cumbersome, time-consuming, and the extraction process requires high-temperature heating treatment; (2) The ratio of the extraction agent is complex, and the storage requirements are high. Leakage is harmful to the human body and easily causes damage to farmland soil and water The environment is easy to cause secondary pollution; (3) The leaching solution used for detection must undergo secondary pH adjustment before it can be used for equipment detection, and the process operation is complicated