Method for separating and enriching trace metal and compound nanometer materials in water bodies
A nanomaterial, separation and enrichment technology, applied in the field of environmental analytical chemistry, can solve the problems of complex operation and the influence of complex matrix, and achieve the effect of large sample volume, high sensitivity and good selectivity
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[0049] Example 1: Determination of the addition of AgNPs in actual water
[0050] (1) Separation and enrichment of AgNPs in four actual water samples by disc solid phase extraction
[0051] Actual water samples do not require any pretreatment. Add AgNPs to 50ng / L in the influent, effluent, river and lake water of a 1.0L sewage treatment plant, shake at 330rpm for ~1h, and use rapid qualitative filter paper to remove some traces of suspended solids in the water. Put the PVDF microporous filter membrane with a pore size of 0.45 μm into the replaceable membrane filter head and build it figure 1 device shown. After sucking the sample into the syringe, push out the syringe at 60mL / min until all 1.0L of the sample passes through the filter membrane. Take out the filter membrane, transfer it to a 1.5mL conical centrifuge tube, add 1.0mL 2% (m / v) FL-70, vortex at 2500rpm for 6h, take out the solution, and proceed to the next step of concentration determination, composition identifi...
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