DGT (diffusive gradients in thin films) enrichment film for measuring bio-activity Hg (II) of paddy soil solution as well as preparation method thereof

A technology of bioavailability and soil solution, which is applied in the field of determination of effective divalent mercury in paddy field soil solution by gradient diffusion film technology, can solve the problems of no commercial purchase, difficulty, and complicated laboratory preparation, so as to facilitate promotion and application , easy to store, and easy to operate

Active Publication Date: 2018-10-19
INST OF GEOCHEM CHINESE ACADEMY OF SCI +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring divalent mercury in paddy field soil by gradient diffusion thin film technology using nanometer SH-MMHs as the enrichment film, which can

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  • DGT (diffusive gradients in thin films) enrichment film for measuring bio-activity Hg (II) of paddy soil solution as well as preparation method thereof
  • DGT (diffusive gradients in thin films) enrichment film for measuring bio-activity Hg (II) of paddy soil solution as well as preparation method thereof
  • DGT (diffusive gradients in thin films) enrichment film for measuring bio-activity Hg (II) of paddy soil solution as well as preparation method thereof

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Embodiment Construction

[0020] The method of the present invention is described below through specific embodiments. Unless otherwise specified, the technical means used in the present invention are methods known to those skilled in the art.

[0021] The invention discloses an in-situ method for measuring effective divalent mercury in paddy field soil solution. The DGT enrichment membrane material is composed of effective mercury adsorption material nanometer SH-MMHs, improved agar gel and dispersant ethanol.

[0022] 1. Material preparation:

[0023] (1) Nanomaterial SH-MMHs: Add 0.3g of metal double-layer hydroxide, 15mL of methanol and 5mL of (3-mercaptopropyl)trimethoxysilane (CAS No. 4420-74-0) to 200mL of toluene solution, The reaction was stirred vigorously under nitrogen for 6h. Then take it out and wash it with ultrapure water for 3-4 times, freeze it in an ordinary refrigerator for 24 hours, then transfer it to a freeze dryer for freeze drying, and pass through a 200-mesh sieve to obtain a...

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Abstract

The invention relates to a DGT (diffusive gradients in thin films) enrichment film for measuring bio-activity Hg (II) of a paddy soil solution as well as a preparation method thereof. The material comprises the followings: a bonding material for adsorbing Hg (II) is modified nanometer sulfydryl metal double-layer hydroxide; a supporting material is modified agar gel; and a dispersing agent is ethanol. A Hg (II) enriched DGT film is prepared by the following steps: putting the materials into ultrapure water with the temperature of 80 DEG C according to the proportion requirement, mixing completely and uniformly, injecting into a glass pane groove with the temperature of 60 DEG C until the groove is sealed, flatly placing, cooling to 25 DEG C and taking out to prepare the Hg (II) enriched DGT film. The enriched film material can enrich the Hg (II) efficiently and rapidly, can be completely dissolved within 30 minutes after 5 ml of concentrated hydrochloride acid or 1M of nitric acid is added, and overcomes the defects that the conventional DGT enriched film for adsorbing the Hg (II) is digested incompletely, is difficult in laboratory preparation, has a low adsorption property in theHg (II) and is difficult to buy.

Description

technical field [0001] The invention relates to a method for measuring the biologically available state of divalent mercury in paddy field soil solution, in particular to a method for measuring the bioavailable state of divalent mercury in paddy field soil by gradient diffusion film technology of an enrichment film made of nano-SH-MMHs binding material Method for effective divalent mercury in solution. Background technique [0002] Paddy soil heavy metal pollution has the characteristics of concealment, long-term, non-degradable and irreversible. Once excessive heavy metals enter the paddy soil, it will not only affect the growth, yield and quality of crops, but will also be absorbed by crops through the food chain and biomagnification effects. human health. Rice is the staple food of more than 60% of Chinese people, and now the heavy metal pollution of rice is increasingly surfaced. According to estimates by the environmental protection department, 12 million tons of grai...

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 姚珩赵玉杰易凤姣梁学峰冯新斌周其文
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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