Abstract

The effect of pH on the extraction efficiency of organic bases and lindane from aqueous solutions by extractive freezing-out into acetonitrile under centrifugation conditions is studied. The technological capabilities and advantages of this method of sample preparation to the determination of organic substances in aqueous media are demonstrated. In combination with gas chromatography, single-step extractive freezing-out in the sample centrifugation mode ensures the minimum limits of detection in 10 mL of drinking water, mg/L: 0.1 for aniline, 0.05 for diphenylamine, 0.015 for caffeine, and 0.001 for lindane. The developed extraction technology is simple and performed in one step. The duration of sample preparation does not exceed 30 min; the consumption of the extractant is less than 1 mL.

中文翻译：

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离心萃取冷冻——以有机碱为例的化学分析样品制备新技术

摘要

研究了 pH 值对离心条件下通过萃取冷冻至乙腈从水溶液中萃取有机碱和林丹的效率的影响。展示了这种样品制备方法在测定水性介质中的有机物质方面的技术能力和优势。结合气相色谱，样品离心模式下的单步萃取冷冻确保10mL饮用水中的最低检测限，mg/L：苯胺0.1，二苯胺0.05，咖啡因0.015，0.001林丹。开发的提取技术简单，一步完成。样品制备时间不超过30分钟；萃取剂用量小于1mL。