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首页> 外文期刊>Separation and Purification Technology >Removal of arsenic in the form of anions from solid matrices by supercritical CO_2 extraction with ion-pairing
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Removal of arsenic in the form of anions from solid matrices by supercritical CO_2 extraction with ion-pairing

机译：通过离子对超临界CO_2萃取从固体基质中去除阴离子形式的砷

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摘要

A new method for the removal of the arsenic in the form of anions such as arsenite and arsenate, from solid samples by supercritical CO_2 extraction coupled with ion pairing was investigated. Tetrabutylammonium bromide (Bu_4NBr) was used as the ion-pairing reagent. As a result of the insolubility of Bu_4NBr in supercritical CO_2, the extraction of the anions by supercritical CO_2 with the in situ ion-pairing is not effective. The arsenic in the form of anions in the solid samples can be effectively removed by supercritical CO_2 extraction with pre-ion-pairing. For the case of the pre-ion pairing, the extraction efficiency was strongly dependent on the dosage of Bu_4NBr.
机译：研究了一种通过超临界CO_2萃取和离子对从固体样品中去除砷（如砷酸根和砷酸根）形式的砷的新方法。溴化四丁基铵（Bu_4NBr）被用作离子对试剂。由于Bu_4NBr在超临界CO_2中不溶，通过超临界CO_2进行原位离子配对萃取阴离子是无效的。固体样品中阴离子形式的砷可以通过预先离子对的超临界CO_2萃取来有效去除。对于离子对配对的情况，提取效率强烈取决于Bu_4NBr的剂量。

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