Method for in-situ sampling, separating enriching and measuring heavy metal ion in water body

Abstract

A method to sample in situ, separate, enrich and measure heavy metal ion in waters. Its steps contain: (1) Puts some high-molecular compound being capable of occurring chemical reaction with heavy metal ion into device and uses a semi-permeable membrane being able to permeate heavy metal ion to cover it. (2) Puts device into waters and detaches it from waters by membrane. (3) Sets in waters for a period of time. Recur to osmosis of membrane, heavy metal ion enters into back of device to occur chemical reaction with high-molecular compound. (4) Takes out device located in waters to measure concentration and mean concentration of heavy metal in waters by atomic absorption spectrometry. It is characterized in that simple, economical, providing concentration and measurement in situ for much heavy metal, has selectivity.

Description

technical field [0001] The invention relates to the technical field of chemical and environmental monitoring, in particular to a method for in-situ sampling, separation, enrichment and measurement of heavy metal ions in a water body. Background technique [0002] Heavy metals are the most prominent inorganic pollutants in the environment, mainly because heavy metals cannot be decomposed by microorganisms and are easy to accumulate and transform. Some can even pass through the food chain and accumulate in harmful concentrations in the human body. Heavy metal pollution in the environment mainly includes mercury, cadmium, lead, copper, chromium, arsenic, nickel, and iron (although arsenic is not a heavy metal, it is usually included in the discussion of heavy metals because of its source and hazards are similar to heavy metals). Reliable measurement of trace metal ions in natural water is of great importance for the study of pollution and trace element recovery. However, due ...

AI Technical Summary

Problems solved by technology

However, due to the low concentration of the analyte in environmental samples, complex components, many interfering substances, the same element exists in multiple forms, and is easily changed by environmental influences, usually the detection method can only be analyzed and determined after complex pretreatment

The classic pretreatment method not only relies on manual operation, but also has high work intensity, long processing cycle, requires a large amount of organic solvents, and has poor reproducibility, which brings great errors to the analysis work.

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