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Method for determining content of bioavailable heavy metal in compost sample

A biologically effective, heavy metal technology, used in measuring devices, instruments, scientific instruments, etc., to achieve the effect of good repeatability and high accuracy

Inactive Publication Date: 2013-01-30
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

Compared with the traditional chemical method, it has the advantages of not changing the form of heavy metals and intuitively reflecting the effective concentration, so it is more common in the determination of the bioavailability of heavy metals in water, sediment and soil at home and abroad, but the application of DGT technology to the determination or evaluation of compost The bioavailability of heavy metals has rarely been reported

Method used

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  • Method for determining content of bioavailable heavy metal in compost sample
  • Method for determining content of bioavailable heavy metal in compost sample
  • Method for determining content of bioavailable heavy metal in compost sample

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Embodiment 1

[0043]Some fresh chicken manure was collected from a chicken farm around Beijing, mixed with sawdust and hay to adjust the C / N ratio to 26 and the moisture content to 55.21%, and then composted in a static composting reactor. After 25 days, the primary fermentation was completed, and the water was replenished and turned over for the secondary fermentation. After 45 days, the secondary fermentation was completed, and the samples of the first, 8th, 25th, 35th and 45th days of composting were taken in appropriate amounts. Add the collected chicken manure compost samples into ultrapure water according to the dry weight and ultrapure water volume ratio of 1:10 [W(g) / V(mL)], and extract with horizontal vibration at 200r / min at room temperature for 24h, then 4°C, Centrifuge at 12000r / min for 20min, pass the supernatant through a 0.45μm filter membrane to obtain a filtrate, dilute the filtrate in a certain proportion to the concentration suitable for ICP-OES determination of heavy meta...

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Abstract

The invention relates to a method for determining the content of bioavailable heavy metal in a compost sample, which mainly comprises the following steps that A, different proportions of pure water are added to the compost sample, supernatant liquids are respectively filtered, and filtrates are collected to obtain a series of filtrates with different quantities of added water; B, a film diffusion gradient device is respectively put into each filtrate and arranged on a magnetic stirrer for adsorption reaction, a binder phase of each film diffusion gradient device is taken out, a HNO3 solution is added to fully immerse the binder phase, and the concentration of the heavy metal in the solution is determined after leaching; and C, the concentration of the heavy metal which is accumulated in the binder phase and the film diffusion gradient device is calculated. The method has the characteristics of high precision and good repeatability and stability, and the concentration of the bioavailable heavy metal in the compost sample can be accurately and quantitatively analyzed in a natural rainfall condition.

Description

technical field [0001] The invention belongs to the field of solid organic waste treatment and resource application, and specifically relates to a method of enriching biologically available heavy metals in compost samples by using thin-film diffusion gradient technology (DGT technology), and calculating their effective concentration, and then evaluating biologically available heavy metals in compost samples. Method for effective state heavy metal content. Background technique [0002] Sludge from urban sewage plants and livestock and poultry manure both contain a certain amount of heavy metals: the former mainly comes from the original heavy metals in the sewage, as well as the aluminum and iron salts added in the sewage treatment process; the latter mainly comes from the prevention and treatment of livestock and poultry diseases and promoting Heavy metals added to feed and additives for growth and development. Municipal sludge and livestock manure are rich in organic matte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 席北斗李丹何小松魏自民赵国鹏
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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