Method for detecting bioavailable lead in soil

Abstract

A method for detecting bioavailable lead in soil comprises the following steps: s100, collecting and pretreating a sample, to be more specific, collecting the soil, air-drying the collected soil at room temperature, grinding, sieving by a 200-mesh sieve to prepare the soil sample, weighing 1-5 g of the soil sample, and putting the soil sample into a 250 ml polytetrafluoroethylene centrifugal cup,respectively adding 25 ml of a 1 mol / L strontium chloride solution and 25 ml of a 0.5mol / L glucose solution, stirring by a constant-temperature magnetic stirrer, centrifuging by a centrifugal machine,taking supernate, filtering the supernate with a filtering membrane to obtain an extracting solution, and diluting the extracting solution to a scale by using a HNO3 solution with the concentration of 1%; s200, determining the concentration of the bioavailable lead in the extracting solution, to be more specific, establishing a standard curve used for determining the different concentrations of the bioavailable lead by adopting an atomic absorption spectrometer through a flame atomic absorption method, and measuring the concentration of the bioavailable lead in the extracting solution throughthe standard curve by adopting the atomic absorption spectrometer; and s300, analyzing results, to be more specific, according to the measured mass of the soil sample and the measured concentration of the extracting solution, calculating the content of the bioavailable lead in the measured soil sample.

Description

technical field [0001] The invention relates to the technical field of soil environmental protection detection, in particular to a detection method for biologically available lead in soil. Background technique [0002] Lead is in group IVA, the sixth period, in the periodic table of elements. Lead has good ductility and corrosion resistance, and it is easy to make alloys with other metals with excellent properties. Metal lead, lead alloys and their compounds are widely used in storage batteries, cable sheaths, machinery manufacturing, shipbuilding, light industry, lead oxide, radiation protection and other industries. Lead is a toxic heavy metal that is extremely harmful to the human body. After entering the body, lead and its compounds will cause harm to multiple systems such as nerves, hematopoiesis, digestion, kidneys, cardiovascular and endocrine systems. If the content is too high, it will cause lead poisoning . With the rapid development of the industrial market, le...

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Problems solved by technology

Due to the rapid development of industrialization, urbanization and agricultural intensification, soil lead pollution in China is increasing, and it has become the second largest soil heavy metal polluting element after lead. However, due to the complexity of its environmental matrix, accurate extraction and It is very difficult to detect the content of lead element, especially the extraction of active lead, which is easily absorbed by human body, animals or plants, is even more difficult

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