Preparation method of seawater with low heavy metal content
A technology with low heavy metals and seawater, applied in the field of environmental analysis experiments, can solve the problems of unfavorable popularization and use of general chemical laboratories and high cost, and achieve the effects of favorable popularization and use, simple preparation method and low acquisition cost.
Inactive Publication Date: 2018-11-06
广西壮族自治区海洋环境监测中心站
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Problems solved by technology
Ocean water is far away from land-based pollution sources, but its acquisition cost is relatively high, which is not conducive to the promotion and use of general chemical laboratories
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[0016] The present invention will be described in detail below in combination with specific embodiments.
[0017] The preparation method of seawater with low heavy metal content of the present invention, the preparation steps are as follows:
[0018] 1) Removal of copper, lead, nickel and cadmium: take the nearshore seawater and place it in a separatory funnel, adjust the pH of the nearshore seawater to 5-6 with hydrochloric acid and ammonia water, and add 2% buffer in turn according to the volume fraction of the prepared seawater Solution A, 6% chelating agent and 20% extracting agent, then mixed and shaken for 2 min, allowed to stand for layers, and discarded the organic phase;
[0019] 2) According to step 1), the aqueous solution obtained after repeated extraction and purification for 3 times is purified seawater;
[0020] 3) Removal of zinc and chromium: take the purified seawater in step 2, adjust the pH of the purified seawater to 3.6-4.0 with ammonia water, and add 5%...
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The invention provides a preparation method of seawater with low heavy metal content. The method comprises the following preparation steps of (1) removing copper, lead, nickel and cadmium; (2) repeatedly performing extraction and purification for three times according to the step (1); (3) removing zinc and chromium; (4) after repeated extraction and purification for three times in the step (3), obtaining a water solution, i.e., purified seawater with low heavy metal content. The preparation method of the seawater with low heavy metal content has the advantages that a chelating agent is used for chelating heavy metal in seawater under different pH conditions; then, through an organic solvent, the chelating agent is extracted and separated; in the chelating agent extracting process, heavy metal in chelated seawater is extracted, so that the goal of removing heavy metal is achieved. The goals that offshore seawater is used as a water source, and heavy metal contaminants are removed by a purification mean; the prepared seawater with low heavy metal content meets the quantitative analysis requirement of the heavy metal contaminants of the seawater; the preparation method is simple; theobtaining cost is low; the popularization and the use of chemical laboratories are facilitated.
Description
technical field [0001] The invention belongs to the field of environmental analysis experiments, and in particular relates to a method for preparing seawater with low heavy metal content. Background technique [0002] In the process of marine environmental monitoring, the quantitative detection of heavy metals in seawater faces the interference of seawater matrix (mainly salt). For accurate quantitative analysis, a quantitative method based on matrix matching is widely used, that is, seawater with similar composition and content and extremely low heavy metal content is used as a solvent, and heavy metal solutions with different content gradients are prepared as a calibration curve to quantitatively analyze heavy metal pollution in target seawater substance content. In order to obtain seawater with similar composition and content and extremely low heavy metal content, oceanic seawater is mostly used in laboratories at present. Ocean water is far away from land-based polluti...
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IPC IPC(8): G01N1/34C02F9/04C02F103/08
CPCC02F1/26C02F1/62C02F1/66C02F9/00C02F2103/08C02F2301/08G01N1/34
Inventor 洪鸣闭文妮蓝文陆彭梦微陆山黄彦明李业燕杨家欢陈进营谭仁烨贺亮吴磊石
Owner 广西壮族自治区海洋环境监测中心站