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六溴环十二烷(HBCDs)和四溴双酚A(TBBPA)是两类广泛生产和使用的溴代阻燃剂。 因它们具有持久性、生物富集、毒性等特征,当无意泄露进入环境中,会对生态系统和生物体造成潜在危害。在国内外各种环境介质和生物体中均有两种目标物的检出[1-5]。为了降低环境风险,2013年,HBCDs被列入斯德哥尔摩公约附件A加以禁止生产和使用,我国在2021年底也全面停止六溴环十二烷的生产和使用。HBCDs是非极性化合物,而TBBPA具有一定的极性,目前两者的分析方法主要以液相色谱质谱法为主, 但是国外尚未发布水体中同步测定HBCDs和TBBPA的分析方法,而国内的分析方法主要集中在单一目标物的总量分析。为保护生态环境,服务我国履约监测的需要,本文基于硅胶固相萃取柱的前处理净化措施,建立了同步测定水中HBCDs和TBBPA的高效液相色谱-串联质谱同位素稀释法。
高效液相色谱-串联质谱法测定水中的六溴环十二烷和四溴双酚A
Determination of hexabromocyclododecanes and tetrabromobisphenol a in water by high performance liquid chromatography-tandem mass spectrometry
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摘要: 本文建立了同时测定水中六溴环十二烷(HBCDs)和四溴双酚A(TBBPA)的高效液相色谱-串联质谱方法。酸化后的水样(pH=2—4)经二氯甲烷液液萃取,硅胶固相萃取小柱净化后,经LC-MS/MS检测,采用同位素稀释法进行定量。目标化合物的方法检出限在0.3—0.5 ng·L−1之间,不同水质样品平行添加的回收率为91.8%—117%,相对标准偏差是3.1%—11.9%。该方法灵敏度高、可靠性强,能够适用于环境各类水体中痕量HBCDs和TBBPA的监测要求。
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关键词:
- 六溴环十二烷 /
- 四溴双酚A /
- 液相色谱-串联质谱法 /
- 水体
Abstract: A method for simultaneous determination of hexabromocyclododecanes (HBCDs) and tetrabromobisphenol A (TBBPA) in waters was developed using LC-MS/MS. After being adjusted to pH=2—4, the water sample was subjected to liquid–liquid extraction using dichloromethane, and the extractant was then cleaned up by silica gel solid phase extraction (SPE) cartridge. The resultant sample was analyzed using LC-MS/MS and quantified by isotope dilution method. The limits of detection were in the range of 0.3—0.5 ng·L−1, and spiking recoveries ranged from 91.8% to 117%, with relative standard deviations of 3.1%—11.9%. The established method was reliable, sensitive and was suitable for the determination of HBCDs and TBBPA in various types of water matrixes.-
Key words:
- hexabromocyclododecane /
- tetrabromobisphenol A /
- LC-MS/MS /
- water
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表 1 HBCDs和TBBPA及其同位素内标的MRM采集参数
Table 1. MRM mass spectrometric acquisition parameters of HBCDs and TBBPA
化合物
Compound前体离子(m/z)
Precursor ion子离子(m/z)
Product ion碎裂电压/V
Fragmentor碰撞能/V
Collision energyα-HBCD 640.6 79*/81 80 17/10 β-HBCD 640.6 79*/81 80 17/10 γ-HBCD 640.6 79*/81 80 17/10 13C12- α-HBCD 652.6 79*/81 80 11/21 13C12-β-HBCD 652.6 79*/81 80 11/21 13C12-γ-HBCD 652.6 79*/81 80 11/21 D18-α-HBCD 658.6 79*/81 80 11/21 TBBPA 542.7 417.7*/291 200 46/47 13C12-TBBPA 554.7 430.7*/296.7 200 40/40 注: *指定量离子。 表 2 HBCDs和TBBPA的正己烷/二氯甲烷线性关系及检出限、定量限
Table 2. R2, LOD, LOQ and linear range of HBCDs and TBBPA different types of environmental water matries
化合物
Compound线性范围/(μg·L−1)
Linear range平均相对响应因子
Average RRF相对响应因子的相对标准偏差/%
RSD of average RRFLOD/(ng·L−1) LOQ/(ng·L−1) TBBPA 0.5—100 1.85 6.76 0.4 1.2 α-HBCD 0.5—100 1.21 11.5 0.3 1.2 β-HBCD 0.5—100 1.13 7.05 0.5 2.0 γ-HBCD 0.5—100 1.19 5.64 0.5 2.0 表 3 不同水质基质加标的回收率和精密度数据
Table 3. Recoveries and RSD of HBCDs and TBBPA in different types of environmental water matrixes
基质
Matrixes添加水平/(ng·L−1)
Spiking levelsα-HBCD β-HBCD γ-HBCD TBBPA 回收率/%
RecoveryRSD/% 回收率/%
RecoveryRSD/% 回收率/%
RecoveryRSD/% 回收率/%
RecoveryRSD/% 水空白 5 108 5.5 112 8.3 111 8.6 110 11.9 20 94.0 9.6 97.0 7.4 96.1 10.2 96.5 6.1 100 99.5 10.7 104 8.7 99.3 9.5 100 6.8 地下水 5 112 8.6 117 4.9 115 6.5 114 10.4 20 100 10.1 103 8.4 100 9.6 97.5 6.7 地表水 5 117 6.0 115 6.4 111 7.8 110 11.9 20 91.8 6.4 96.5 6.3 93.9 8.8 93.3 3.5 生活污水 20 103 4.5 100 5.0 97.4 5.6 98.4 3.1 100 103 6.9 104 5.0 103 5.7 103 5.2 工业废水 20 94.7 4.0 95.8 4.9 93.8 6.6 92.4 3.9 100 102 4.6 107 5.5 104 5.7 104 3.6 海水 5 107 7.7 106 3.5 109 6.5 102 6.7 20 105 5.5 111 6.4 109 6.0 115 7.8 -
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