用同位素稀释的气相色谱／高分辨质谱联用测定中国珠江流域鱼体中氯化二苯并二嗯英和氧化二苯并呋喃

Objective：PCDD/Fs level in 22 fish samples was investigated in Pearl river Delta area in order that the PCDD/Fs pollution level in common fish can be evaluated. Methods： Dibenzo-p-Dioxins and Dibenzo-Furans was extracted from the sample by Soxhlet extraction, concentrated then purified by column chromatography, carbon column enrichment,. Confirmation and quantitative analysis at ppt（pg/g） level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode（MID）. Certified reference material using Proficiency test sample fish muscle test material 0613 that was obtained from Central Science Laboratory（CSL） in Britain. Results： The average of concentration in wet weight is 1.261 ng/kg,, the average total WHO-TEQ for 22 samples is 0.246ng/kg wet weight. Generally, OCDD, 2,3,7,8-TCDF, 1,2,3,4,6,7,8-HpCDD was the main contributors to the total 17 PCDD/Fs detected, average account for 21%,16%,14%, respectively. While 1,2,3,7,8-PeCDD, 2,3,4,7,8-PeCDF, 2,3,7,8-TCDD were main contributors to the total WHO-TEQ, account for 40%,27%, 13% respectively. The total TEQ for 22 fishes ranged from 0.03 ng/kg wet weight to 0.878 ng/kg wet weight. Conclusions： PCDD/Fs level was largely different from sample to sample depending on the sample kinds. The level in the Pearl river Delta area fish samples is not distinct comparing with other countries, but some kind fish level should be paid more attention on it since its higher level. The relationship between source of PCDD/Fs and PCDD/Fs level in fish will be studied deeply in the future.     

吹扫捕集-气相色谱质谱法测定地表水中苯系物的方法研究

采用吹扫捕集-气相色谱质谱法测定地表水中的苯系物。对吹扫捕集的烘烤时间、吹扫时间、解析时间等试验条件进行了优化,并用优化条件对地表水样进行测试分析。结果表明,当烘烤时间为20min、吹扫时间为11min、解析时间为1min时,可以获得最高灵敏度和最低检出限。本方法适用于地表水中苯系物的分析,线性范围为1.0~40.0μg/L,最低检出浓度可达0.101~0.145μg/L,加标回收率为85.1~94.9%。