Heavy metal available state adsorption membrane and heavy metal available state detection method

Abstract

The invention provides a heavy metal available state adsorption membrane and a heavy metal available state detection method, relates to the technical field of heavy metal available state adsorption detection. A binding phase in a DGT device is a sodium alginate-polyglutamic acid gel binding phase, SA-PGA resin powder is put in an acrylamide gel solution and is mixed uniformly, then ammonium persulfate and tetramethylethylenediamine are added, the mixture is injected into a glass mold and cultured at a certain temperature, the glass mold is placed in distilled water for a period and then gel formed in the glass mold is taken out, the distilled water is hydrated so as to obtain the sodium alginate-polyglutamic acid gel. The heavy metal available state adsorption membrane is used as the binding phase of the DGT device, accumulated quantity of heavy metal ions in the binding phase is measured, the heavy metal ion DGT conversion concentration is calculated, and the availability of the heavymetal is measured by combining the accumulation quantity and the DGT conversion concentration. The membrane and the method are easy to operate, are low in cost, have no secondary pollution, can concentrate multiple heavy metals simultaneously, have high adsorption rate and high adsorption volume, low detection limit and small detection error.

Description

technical field [0001] The invention relates to the technical field of heavy metal effective state adsorption detection, in particular to a heavy metal effective state adsorption film and a heavy metal effective state detection method. Background technique [0002] Heavy metal pollution in soil not only leads to the degradation of land quality, affects the safety of agricultural products, but also poses a serious threat to human and animal health through the food chain. Because soil pollution has the characteristics of concealment, accumulation, and hysteresis, once it is polluted, it will cause irreversible and serious consequences. Studies have shown that the total amount of heavy metals in the soil cannot completely determine its environmental behavior and ecological effects. Its existing form and form ratio are the key factors that determine its environmental chemical process and biological availability. Heavy metal speciation analysis techniques should be combined with ...

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Problems solved by technology

Although the traditional chelex-100-DGT can measure 55 kinds of heavy metals at the same time, this kind of material needs to be imported, which is expensive and time-consuming. However, domestic research on DGT is mostly used for the adsorption of one or two heavy metals in an effective state, and cannot be used simultaneously. Adsorbs a variety of effective states of heavy metals, the adsorption amount is small, the adsorption rate is low, the scope of application is narrow, and the adsorption effect on trace elements in the environment is poor, and the quantitative accumulation and measurement of the effective states of heavy metals in polluted complex environments becomes time-consuming strenuous

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