采用衍生化处理和气相色谱-质谱联用分析方法, 测定了珠江口及其以东近海海域表层海水中的三氟乙酸(Trifluoroacetic acid, TFA)含量。珠江口及其以东近岸的红海湾和大亚湾海区TFA浓度范围分别为113—170ng.L–1和202—336ng.L–1。红海湾内海水中TFA的平均水平(279ng.L–1)明显高于外海海水(210ng.L–1), 说明港湾内或其周边地区可能有TFA的点源输入。此外, 外海海水中TFA平均浓度比珠江口高69.1ng.L–1, 表明这种亲水性强、稳定性高的化合物除了已知的人为来源外, 可能还存在未知的人为源或自然源, 使得海洋作为其最终的汇浓度不断累积。

Trifluoroacetic acid (TFA) levels in surface waters of the Pearl River Estuary and neighboring eastern offshore sea area were determined by Gas Chromatography-Mass Spectrometry after derivatization process. TFA levels in surface water ranged from 113 to 170ng.L–1 in the Pearl River Estuary and from 202 to 336ng.L–1 in neighboring Daya Bay and Honghai Bay. The average TFA concentration in coastal waters of the Honghai Bay was 279ng.L–1, which was much higher than that in the water samples from the open sea (210ng.L–1), suggesting possible source input within or around the Honghai Bay. The average TFA level in surface waters of open sea was 69.1ng.L–1 higher than that in surface waters of the Pearl River Estuary, indicating unknown anthropogenic or natural sources leading to accumulation in the ocean as final sink of this strongly hydrophilic and fully persistent chemical.

国家自然科学基金(40821003); NSFC−广东联合基金(U0833003); GIG领域前沿项目(GIGCX-08-07)

[1] WMO (World Meteorological Organization). Scientific assessment of stratospheric ozone: 1989 global ozone research and monitoring project—report No. 20 [R]. Geneva, Switzerland. 1989.
[2] WALLINGTON T J, SCHNEIDER W F, WORSNOP D R, et al. The environmental impact of CFC replacements—HFCs and HCFCs [J]. Environ Sci Technol, 1994, 28(7): A320- A326.
[3] ELLIS D A, MABURY S A, MARTIN J W, et al. Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the environment [J]. Nature, 2001, 412(6844): 321-324.
[4] JORDAN A, FRANK H. Trifluoroacetate in the environment: evidence for sources other than HFC/HCFCs [J]. Environ Sci Technol, 1999, 33(4): 522-527.
[5] KEY B D, HOWELL R D, CRIDDLE C S. Fluorinated organics in the Biosphere [J]. Environ Sci Technol, 1997, 31(9): 2445-2454.
[6] ELLIS D A, MARTIN J W, DESILVA A O, et al. Degradation of fluorotelomer alcohols: a likely atmospheric source of perfluorinated carboxylic acids [J]. Environ Sci Technol, 2004, 38(12): 3316-3321.
[7] CAHILL T M, THOMAS C M, SCHWARZBACH S E, et al. Accumulation of trifluoroacetate in seasonal wetlands in California [J]. Environ Sci Technol, 2001, 35(5): 820-825.
[8] ELLIS D A, HANSON M L, SIBLEY P K, et al. The fate and persistence of trifluoroacetic and chloroacetic acids in pond waters [J]. Chemosphere, 2001, 42(3): 309-318.
[9] BOWDEN D J, CLEGG S L, BRIMBLECOMBE P. The Henry's law constant of trifluoroacetic acid and its partitioning into liquid water in the atmosphere [J]. Chemosphere, 1996, 32(2): 405-420.
[10] ZEHAVI D, SEIBER J N. An analytical method for trifluoroacetic acid in water and air samples using headspace gas chromatographic determination of the methyl ester [J]. Anal Chem, 1996, 68(19): 3450-3459.
[11] BOUTONNET J C, BINGHAM P, CALAMARI D, et al. Environmental risk assessment of trifluoroacetic acid [J]. Human Ecol Risk Assess, 1999, 5(1): 59-124.
[12] BERENDS A G, BOUTONNET J C, DE ROOIJ C G, et al. Toxicity of Trifluoroacetate to aquatic organisms [J]. Environ Toxicol Chem, 1999, 18(5): 1053-1059.
[13] SCOTT B F, MACDONALD R W, KANNAN K, et al. Trifluoroacetate profiles in the Arctic, Atlantic, and Pacific oceans [J]. Environ Sci Technol, 2005, 39(17): 6555-6560.
[14] 王巧云, 丁翔, 李德军, 等. 环境水样中三氟乙酸的分析[J]. 分析试验室, 2009, 28(5), 68-71.
[15] FRANK H, CHRISTOPH E H, HOLM-HANSEN O, et al. Trifluoroacetate in ocean waters [J]. Environ Sci Technol, 2002, 36(1): 12-15.
[16] ZHANG JIANBO, ZHANG YING, LI JINLONG, et al. Monitoring of trifluoroacetic acid concentration in environmental waters in China [J]. Water Research, 2005, 39(7): 1331-1339.