Cork-Activated Carbon as a Sorptive Phase for Microextraction of Emerging Contaminants in Water Samples

IF 1.1 Q4 CHEMISTRY, ANALYTICAL
Valentina Rojas-Candia, D. Arismendi, E. Carasek, Pablo Richter
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引用次数: 0

Abstract

A novel strategy for microextraction of emerging contaminants was developed by using cork activated carbon (CAC) as the sorbent phase. Carbonization of the natural phase increased the surface area and the porosity of the material, thus improving the extraction efficiency. Moderately polar compounds, such as ibuprofen and its metabolites, were used as model analytes in water samples. Rotating disk sorptive extraction (RDSE) together with gas chromatography‒mass spectrometry (GC‒MS) were used for extraction and determination of the analytes, respectively. The optimum conditions for the material synthesis were 600 °C, K2CO3 as the activating agent and a mass ratio of 0.8:1 (activating agent:raw material). The optimum values for the RDSE were pH 2, a sample volume of 25 mL and an extraction time of 90 min. The absolute recovery rates for ibuprofen and its metabolites ranged from 19 to 55%, and the relative standard deviations were between 3 and 13%. The proposed method was used to measure the analytes in the influent and effluent from a wastewater treatment plant in Santiago, Chile. The concentrations found for ibuprofen and its metabolites were 0.98–9.8 µg L-1 and 0.8–8.6 µg L-1 in the influent and effluent, respectively. Activation of the cork material enabled the synthesis of a sorbent phase with sorption efficiencies similar to those obtained with the commercial octadecylsilane (C18) phase and superior to that observed for styrene-divinylbenzene (S-DVB). This process is simple and cost-effective.
软木活性炭作为吸附相用于水样中新出现污染物的微萃取
通过使用软木活性炭(CAC)作为吸附相,开发出了一种新型的微萃取新兴污染物的策略。天然相的碳化增加了材料的表面积和孔隙率,从而提高了萃取效率。水样中的布洛芬及其代谢物等中等极性化合物被用作模型分析物。旋转盘吸附萃取法(RDSE)和气相色谱-质谱法(GC-MS)分别用于萃取和测定分析物。材料合成的最佳条件为 600 °C,活化剂为 K2CO3,质量比为 0.8:1(活化剂:原材料)。RDSE 的最佳值为 pH 值为 2,样品量为 25 mL,萃取时间为 90 分钟。布洛芬及其代谢物的绝对回收率为 19% 至 55%,相对标准偏差为 3% 至 13%。所提议的方法被用于测量智利圣地亚哥一家污水处理厂的进水和出水中的分析物。进水和出水中布洛芬及其代谢物的浓度分别为 0.98-9.8 µg L-1 和 0.8-8.6 µg L-1。软木材料的活化使吸附剂相得以合成,其吸附效率与商用十八烷基硅烷(C18)相类似,优于苯乙烯-二乙烯基苯(S-DVB)的吸附效率。该工艺简单且具有成本效益。
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来源期刊
CiteScore
1.60
自引率
14.30%
发文量
46
期刊介绍: BrJAC is dedicated to the diffusion of significant and original knowledge in all branches of Analytical Chemistry, and is addressed to professionals involved in science, technology and innovation projects at universities, research centers and in industry.
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