大连市大气中多氯联苯的时空分布与组分特征研究
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摘要
本论文于2007-2008年间,于大连海事大学采集大气PUF态PCBs样品164份,GFF态PCBs样品164份,实验室分离提取目标物,GC-ECD测定含量,结果表明:
大连市大气13种PCBs总浓度平均值为494.20 pg/m~3,浓度范围151.21～1030.98 pg/m~3。其中PUF态PCBs占PCBs总量的59.36%,GFF态PCBs占PCBs总量的40.64%。氯代数较高的PCB同系物更易于分布在GFF态中,而氯代数较低的PCB同系物更易于分布在PUF态中。大连市大气样品中指示性ICES-PCBs浓度平均值为387.08 pg/m~3,浓度范围为129.46～934.73 pg/m~3,占13种PCBs总量的78%。PUF态PCBs对于ICES-PCBs为主要贡献。大连市大气样品中检测到的DL-PCBs的浓度平均值为77.66 pg/m~3,浓度范围为12.39～183.19 pg/m~3,占13种PCBs总量的16%。GFF态中DL-PCBs对于DL-PCBs为主要贡献。
大连市大气中PUF态PCBs浓度的变化与温度的变化基本正相关,GFF态PCBs浓度的变化与温度的变化基本负相关。PCBs总浓度的变化与温度的变化基本正相关,唯独2008年1月,在温度较低的情况下,PCBs浓度却有所提高,可能由于采暖原因所致。大连市大气中PUF态PCBs总量受到光照控制相对较强。大连市大气中平均PCB-∑TEQ为0.855 pg/m~3,总体来看,PCB126对于大连市大气中PCB-∑TEQ贡献最大,为90.92%,GFF态中“dioxin-like PCBs”对于PCB-∑TEQ贡献较大,尤其是在冬季采暖期。
In 2006 and 2007,164 air samples and 164 PM_(10) samples were collected in Dalian Maritime University.Samples were pretreated and analyzed using the GC-ECD based on USEPA standards.The results indicated that:
The average total concentrations of∑13PCBs in the gas phase in the air in Dalian are 494.20 pg/m~3,the concentration range is 151.21～1030.98 pg/m~3.Gas-phase PCBs account for 59.36%of total PCBs,PM_(10) PCBs account for 40.64%of total PCBs. Higher chlorinated PCB homologue tend to distribute in the PM_(10),lower chlorinated PCB homologues tend to distribute in the gas phase.The average total concentrations of ICES-PCBs in the gas phase in the air in Dalian are 387.08 pg/m~3,the concentration range is 129.46～934.73 pg/m~3,account for 78%of total PCBs.ICES-PCBs are main contributions in gas-phase PCBs.The average total concentrations of DL- PCBs in the gas phase in the air in Dalian are 77.66 pg/m~3,and the concentration range is 12.39～183.19 pg/m~3,account for 16%of total PCBs.PCBs in PM_(10) are main contributions in ICES-PCBs.
Concentrations of PCBs in the gas phase in the air in Dalian and temperature changes are basically positive correlation,concentrations of PCBs in the PM_(10) in the air in Dalian and temperature changes are basically negative correlation,except for January 2008,in the case of low temperature,the concentrations of PCBs increased. Reasons may be due to heating.
Concentrations of PCBs in the gas phase in the air in Dalian are not subject to the light control basically.
The average PCB-∑TEQ in the gas phase in the air in Dalian is 0.855 pg/m~3, generally,PCB126 accounts for the largest contribution to the PCB-∑TEQ,with the value of 90.92%."dioxin-like PCBs" in PM_(10) account for the larger contribution to the PCB-∑TEQ,especially in the heating period in the winter.
大连市大气13种PCBs总浓度平均值为494.20 pg/m~3,浓度范围151.21～1030.98 pg/m~3。其中PUF态PCBs占PCBs总量的59.36%,GFF态PCBs占PCBs总量的40.64%。氯代数较高的PCB同系物更易于分布在GFF态中,而氯代数较低的PCB同系物更易于分布在PUF态中。大连市大气样品中指示性ICES-PCBs浓度平均值为387.08 pg/m~3,浓度范围为129.46～934.73 pg/m~3,占13种PCBs总量的78%。PUF态PCBs对于ICES-PCBs为主要贡献。大连市大气样品中检测到的DL-PCBs的浓度平均值为77.66 pg/m~3,浓度范围为12.39～183.19 pg/m~3,占13种PCBs总量的16%。GFF态中DL-PCBs对于DL-PCBs为主要贡献。
大连市大气中PUF态PCBs浓度的变化与温度的变化基本正相关,GFF态PCBs浓度的变化与温度的变化基本负相关。PCBs总浓度的变化与温度的变化基本正相关,唯独2008年1月,在温度较低的情况下,PCBs浓度却有所提高,可能由于采暖原因所致。大连市大气中PUF态PCBs总量受到光照控制相对较强。大连市大气中平均PCB-∑TEQ为0.855 pg/m~3,总体来看,PCB126对于大连市大气中PCB-∑TEQ贡献最大,为90.92%,GFF态中“dioxin-like PCBs”对于PCB-∑TEQ贡献较大,尤其是在冬季采暖期。
In 2006 and 2007,164 air samples and 164 PM_(10) samples were collected in Dalian Maritime University.Samples were pretreated and analyzed using the GC-ECD based on USEPA standards.The results indicated that:
The average total concentrations of∑13PCBs in the gas phase in the air in Dalian are 494.20 pg/m~3,the concentration range is 151.21～1030.98 pg/m~3.Gas-phase PCBs account for 59.36%of total PCBs,PM_(10) PCBs account for 40.64%of total PCBs. Higher chlorinated PCB homologue tend to distribute in the PM_(10),lower chlorinated PCB homologues tend to distribute in the gas phase.The average total concentrations of ICES-PCBs in the gas phase in the air in Dalian are 387.08 pg/m~3,the concentration range is 129.46～934.73 pg/m~3,account for 78%of total PCBs.ICES-PCBs are main contributions in gas-phase PCBs.The average total concentrations of DL- PCBs in the gas phase in the air in Dalian are 77.66 pg/m~3,and the concentration range is 12.39～183.19 pg/m~3,account for 16%of total PCBs.PCBs in PM_(10) are main contributions in ICES-PCBs.
Concentrations of PCBs in the gas phase in the air in Dalian and temperature changes are basically positive correlation,concentrations of PCBs in the PM_(10) in the air in Dalian and temperature changes are basically negative correlation,except for January 2008,in the case of low temperature,the concentrations of PCBs increased. Reasons may be due to heating.
Concentrations of PCBs in the gas phase in the air in Dalian are not subject to the light control basically.
The average PCB-∑TEQ in the gas phase in the air in Dalian is 0.855 pg/m~3, generally,PCB126 accounts for the largest contribution to the PCB-∑TEQ,with the value of 90.92%."dioxin-like PCBs" in PM_(10) account for the larger contribution to the PCB-∑TEQ,especially in the heating period in the winter.
引文
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