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    同位素稀释-气相色谱-质谱法同时测定土壤中邻苯二甲酸酯和有机磷酸酯的含量

    Simultaneous Determination of Phthalate Esters and Organophosphate Esters in Soil by Isotopic Dilution-Gas Chromatography-Mass Spectrometry

    • 摘要: 以严格的质量控制措施来消除背景污染和确保数据有效性,采用题示方法测定了土壤中7种邻苯二甲酸酯(PAEs)和6种有机磷酸酯(OPEs)的含量。土壤样品经自然风干,磨碎,过筛后,分取2.0 g,加入0.5 g无水硫酸钠和含7种氘代PAEs和4种氘代OPEs的1.0 mg·L−1混合定量内标溶液50 µL,平衡30 min。加入10 mL体积比1∶1的正己烷-丙酮混合溶液,振荡30 min,超声10 min,离心5 min,收集上清液。同上重复提取1次,合并上清液,于40 ℃氮吹浓缩至约2 mL后过Florisil玻璃固相萃取小柱,用15 mL体积比4∶1的正己烷-丙酮混合溶液洗脱。收集洗脱液,于40 ℃氮吹至约0.5 mL,加入1.0 mg·L−1氘代多环芳烃混合进样内标溶液50 µL,用正己烷定容至1 mL,按照气相色谱-质谱法测定。结果显示:PAEs和OPEs的质量浓度均在5~400 μg·L−1内和对应峰面积和定量内标峰面积的比值呈线性关系,检出限为0.30~1.39 ng·g−1;对石英砂和土壤样品进行加标回收试验,回收率为89.2%~110%,测定值的相对标准偏差(n=6)不大于10%。方法用于不同来源不同基质土壤样品的分析,邻苯二甲酸二异丁酯、邻苯二甲酸二丁酯和邻苯二甲酸二( 2-乙基)己酯的检出率为100%且检出量较高(84.2~2 795 ng·g−1)。

       

      Abstract: With strict quality control measures to eliminate background contamination and ensure data validity, the method mentioned by the title was used to determine the contents of 7 phthalate esters (PAEs) and 6 organophosphate esters (OPEs) in soil. The soil sample was air-dried naturally, ground, and sieved, then an aliquot (2.0 g) was taken, and 0.5 g of anhydrous sodium sulfate, 50 µL of the 1.0 mg·L1 mixed quantitative internal standard solution containing 7 deuterated PAEs and 4 deuterated OPEs were added, followed by equilibration for 30 min. Then, 10 mL of the n-hexane-acetone mixed solution at volume ratio of 1∶1 was added, the mixture was shaken for 30 min, sonicated for 10 min, and centrifuged for 5 min, and the supernatant was collected. The extraction was repeated once in the same steps, and the supernatants were combined, and concentrated to approximately 2 mL with nitrogen at 40 ℃. The solution obtained was passed through the Florisil glass solid phase extraction cartridge, eluted with 15 mL of the n-hexane-acetone mixed solution at volume ratio of 4∶1. The eluate was collected, and evaporated to approximately 0.5 mL with nitrogen at 40 ℃. Then, 50 µL of the 1.0 mg·L1 deuterated polycyclic aromatic hydrocarbons mixed injection internal standard solution was added, and the volume of the mixed solution was made up to 1 mL with n-hexane, followed by determination according to the gas chromatography-mass spectrometry. It was shown that linear relationships between the mass concentrations of PAEs and OPEs and the peak area ratios of target compounds to quantitative internal standards were kept in the range of 5–400 μg·L1, with detection limits in the range of 0.30–1.39 ng·g1. Tests for recovery was performed using the standard addition method on the quartz sand and soil sample, giving recoveries in the range of 89.2%–110%, and RSDs (n=6) of the determined values were not more than 10%. The proposed method was applied to the analysis of soil samples from different sources and with different matrices, and the detection rates for diisobutyl phthalate, dibutyl phthalate, and diethyl phthalate were 100% with relatively high detected amounts (84.2–2 795 ng·g1).

       

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