Pollution characteristic analysis of parabens compounds in typical lakes in Beijing
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摘要:
通过在冬季和春季分别采集北京市某典型湖泊11个点位的湖水样品,采用固相萃取-液相色谱-三重四极杆串接质谱法测定样品中14种对羟基苯甲酸酯类化合物(PBs),进而对该湖泊PBs的污染水平和分布特征进行分析。结果表明:湖水中共检出10种PBs,其中对羟基苯甲酸甲酯(MeP)和对羟基苯甲酸丙酯( PrP)浓度较高,分别为24.8、44.8 ng/L;同一采样点检出的PBs浓度随季节性变化而变化,与冬季相比,氯代对羟基苯甲酸酯(氯代-PBs)在春季浓度偏低,冬季靠近污水处理厂排污口水样中,氯代-PBs浓度高于其他采样点;外来污水是湖水中PBs的主要来源,春季电厂排水口MeP浓度(24.8 ng/L)高于冬季(1.30 ng/L)。调查结果显示,该湖泊中PBs种类和浓度水平与其他国家地表水相比,属中等浓度水平,湖泊中PBs主要来源于周边污水排放,不同季节PBs浓度变化较大。
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关键词:
- 对羟基苯甲酸酯类化合物(PBs) /
- 湖泊 /
- 季节变化 /
- 氯代对羟基苯甲酸酯(氯代-PBs) /
- 污染水平
Abstract:In order to study the pollution level and distribution characteristics of parabens (PBs) in lakes, the pollution status of 14 PBs in typical lakes in Beijing was investigated and analyzed. The water samples of a lake in Beijing were collected in both winter and summer, and detected by solid-phase extraction and liquid chromatography-triple quadrupole tandem mass spectrometry. The results showed that ten kinds of PBs were detected with high level in the lake, among which methylparaben (MeP, 24.8 ng/L) and propylparaben (PrP, 44.8 ng/L) were the dominant compounds. The concentrations of the target compounds detected at the same sampling site changed seasonally, and the concentrations of chlorinated parabens in spring were lower than those in winter. However, in the winter near the outlet of the wastewater treatment plant, the concentrations of chlorinated parabens were higher than those at other sampling sites. The external sewage was the main source of PBs in the lake water, and the concentration of MeP at the sampling site of the outlet of the power plant in spring (24.8 ng/L) was higher than that in winter (1.30 ng/L). The survey results showed that the species and concentration level of PBs in the lake were medium comparing with those reported in the researches of other nations. The pollution of PBs in the lake mainly came from the surrounding sewage discharge, and the concentration of PBs varied greatly in different seasons.
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Key words:
- parabens (PBs) /
- lake /
- seasonal variation /
- chlorinated parabens /
- pollution level
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表 1 PBs的化学性质
Table 1. Chemical property of PBs
化合物 分子式 分子量 lg Ko/w pKa MeP C8H8O3 152.16 1.66[9] 8.17[9] EtP C9H10O3 166.18 2.19[9] 8.22[9] PrP C10H12O3 180.21 2.71[9] 8.35[9] BuP C11H14O3 194.23 3.24[9] 8.37[9] 对羟基苯甲酸戊酯(PeP) C12H16O3 208.25 3.48 对羟基苯甲酸庚酯(HeP) C14H20O3 236.31 4.41 对羟基苯甲酸辛酯(OcP) C15H22O3 250.34 4.88 对羟基苯甲酸苄酯(BzP) C14H12O3 228.24 3.54[16] 8.18[16] 对羟基苯甲酸(PHBA) C7H6O3 138.12 1.39[17] 8.4 3-氯-4-羟基苯甲酸甲酯
(3-Cl-MeP)C8H7ClO3 186.59 2.27 3,5-二氯-4-羟基苯甲酸
甲酯(3,5-2Cl-MeP)C8H6Cl2O3 221.04 2.88 3-氯-4-羟基苯甲酸乙酯
(3-Cl-EtP)C9H9ClO3 200.62 3,5-二氯-4-羟基苯甲酸
乙酯(3,5-2Cl-EtP)C9H8Cl2O3 235.06 3.32 3,5-二氯-4-羟基苯甲酸
丙酯(3,5-2Cl-PrP)C10H10Cl2O3 249.10 注:Ko/w为正辛醇-水分配系数;pKa为酸度系数。 表 2 质谱检测条件
Table 2. Experimental condition of mass spectrometry
化合物 母离子(m/z) 子离子(m/z) 入口电压/V 解簇电压/V 碰撞入
口电
压/V碰撞能量/eV 碰撞出
口电
压/VMeP 151.0 91.9 −5 −27 −7 −26 −10 EtP 165.0 93.0 −5 −25 −14 −30 −10 PrP 179.0 93.0 −5 −30 −8 −28 −10 BuP 193.0 91.9 −5 −30 −8 −35 −10 PeP 207.1 91.9 −10 −35 −9 −34 −10 HeP 235.1 92.0 −5 −40 −12 −38 −10 OcP 249.1 136.0 −5 −45 −10 −27 −10 BzP 227.0 91.9 −5 −25 −8 −34 −10 PHBA 137.0 93.0 −5 −23 −8 −20 −10 3-Cl-MeP 185.0 126.0 −5 −30 −7 −26 −13 3,5-2Cl-MeP 218.9 160.0 −5 −40 −8 −28 −15 3-Cl-EtP 199.0 170.9 −5 −32 −7 −20 −15 3,5-2Cl-EtP 232.9 161.1 −5 −36 −8 −30 −16 3,5-2Cl-PrP 246.8 160.0 −9 −45 −10 −32 −16 MeP-d4 155.0 96.1 −10 −25 −10 −28 −10 EtP-d5 170.0 91.9 −5 −26 −8 −30 −10 PrP-d7 186.1 91.9 −5 −30 −8 −33 −10 BuP-d9 202.1 91.9 −5 −30 −8 −34 −10 BzP-d7 233.9 135.9 −9 −40 −10 −20 −13 PHBA-d4 141.0 97.1 −5 −23 −8 −18 −10 表 3 14种PBs的线性范围和检出限
Table 3. Linear range and limit of detection of 14 PBs
化合物 替代物 相关系数(R2) 线性范围/(μg/L) 检出限/(μg/L) MeP MeP-d4 0.998 5 0.1~500 0.10 EtP EtP-d5 0.996 2 0.1~500 0.08 PrP PrP-d7 0.998 1 0.5~500 0.27 BuP BuP-d9 0.998 2 0.05~500 0.05 PeP BuP-d9 0.998 4 0.5~500 0.43 HeP BuP-d9 0.999 1 0.5~500 0.04 OcP BuP-d9 0.999 0 0.05~500 0.04 BzP BzP-d7 0.998 3 0.1~500 0.07 PHBA PHBA-d4 0.993 4 0.5~500 0.16 3-Cl-MeP MeP-d4 0.998 6 0.5~500 0.27 3,5-2Cl-MeP MeP-d4 0.999 2 0.5~500 0.10 3-Cl-EtP EtP-d5 0.998 3 0.5~500 0.35 3,5-2Cl-EtP EtP-d5 0.999 8 0.5~500 0.40 3,5-2Cl-PrP PrP-d7 0.999 1 0.1~500 0.06 表 4 S6采样点回收试验结果
Table 4. Result of recovery test at S6 sampling site
化合物 2020年11月采样 2021年5月采样 浓度/
(ng/L)加标浓度/
(ng/L)回收率/
%浓度/
(ng/L)加标浓度/
(ng/L)回收率/
%MeP 3.94 49.3 90.7 8.48 52.4 87.8 EtP ND 46.3 92.6 ND 42.9 85.8 PrP ND 43.2 86.4 ND 43.1 86.2 BuP ND 43.7 87.4 ND 42.9 85.8 PeP ND 44.2 88.4 ND 41.4 82.8 HeP ND 43.6 87.2 ND 46.9 93.8 OcP ND 42.4 84.8 ND 40.5 81.0 BzP ND 44.6 89.2 ND 43.9 87.8 PHBA ND 46.6 93.2 259 302 86.0 3-Cl-MeP ND 45.9 91.8 ND 43.6 87.2 3,5-2Cl-MeP 19.7 64.2 89.0 3.18 48.3 90.2 3-Cl-EtP ND 46.6 93.2 0.60 45.7 90.2 3,5-2Cl-EtP 15.0 61.3 92.6 10.3 55.9 91.2 3,5-2Cl-PrP 11.1 54.5 86.8 6.52 50.6 88.2 注:ND表示未检出。 表 5 湖泊水样中PBs浓度
Table 5. Concentration of PBs in water samples of the lake
化合物 最大浓度/
(ng/L)最小浓度/
(ng/L)平均浓度/
(ng/L)中位值/
(ng/L)检出率/
%MeP 24.8 0.45 7.89 7.1 100 EtP 4.66 ND 0.29 ND 6.25 PrP 44.8 ND 5.67 2.47 68.8 BuP 3.82 ND 0.35 ND 25 PeP ND ND ND ND ND HeP ND ND ND ND ND OcP 0.13 ND 0.01 ND 6.25 BzP 0.55 ND 0.03 ND 6.25 PHBA 1023 ND 379 292 68.8 3-Cl-MeP ND ND ND ND ND 3,5-2Cl-MeP 19.7 2.12 6.09 3.16 100 3-Cl-EtP 0.60 ND 0.04 ND 6.25 3,5-2Cl-EtP 28.0 8.94 14.5 13.5 100 3,5-2Cl-PrP 11.1 2.4 7.16 7.44 100 注:ND表示未检出。采样点数量(n)为16个。 -
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