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首页> 外文期刊>International journal of environmental analytical chemistry >EXTRACTION AND DETERMINATION OF TRACE AMOUNTS OF RHENIUM IN PLANTS
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EXTRACTION AND DETERMINATION OF TRACE AMOUNTS OF RHENIUM IN PLANTS

机译：植物中痕量A的提取与测定

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摘要

Three procedures for extraction of rhenium from plant material are developed with a view of its subsequent quantitative determination according to a catalytic N, N-Dimethyldithiooxamide (DMDTO) spectrophoto-metric method. They include: (ⅰ) laboratory variant through ashing the plant material and extraction of Re from the ash with hot NaOH solution; (ⅱ) field test - Re is coextracted with the chlorophyll from the plant by hot ethanol. Ethanol extract is further evaporated. The chlorophyll is destructed either thermally or with HCl. Re is then extracted with NaOH solution; (ⅲ) direct extraction of Re from the chlorophyll with HCl, alkalization of the extract with NaOH, oxidation of organic substances with H_2O_2 under heating. The developed procedures allow the subsequent determination of Re content in plants using catalytic DMDTO spectrophotometric method in a wide concentration interval from 3 to n x 10~3 ng g~(-1) Re. They are applied to analysis of plant samples collected in the vicinity of ore mining and in unpolluted areas in Bulgaria.
机译：鉴于其随后根据催化N，N-二甲基二硫代乙酰胺（DMDTO）分光光度法的定量测定，开发了三种从植物材料中提取procedures的方法。它们包括：（ⅰ）通过灰化植物材料并用热的NaOH溶液从灰中提取Re来进行实验室改造； （ⅱ）田间试验-通过热乙醇将Re与植物中的叶绿素共提取。乙醇提取物进一步蒸发。叶绿素被热破坏或被HCl破坏。然后用NaOH溶液萃取Re。 （ⅲ）用HCl直接从叶绿素中提取Re，用NaOH碱化提取物，在加热下用H_2O_2氧化有机物。所开发的程序允许随后使用催化DMDTO分光光度法在3至n x 10〜3 ng g〜（-1）Re的宽浓度范围内测定植物中的Re含量。它们可用于分析在矿石开采附近和保加利亚未污染地区收集的植物样品。

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