电路板蚀刻废液及其回收铜盐产品中PCBs污染特征

Polychlorinated Biphenyls in Spent Etching Solutions and Their Copper Salt Recycling Products

POPs（持久性有机污染物）是近年来广受关注的一类环境污染物.为研究工业过程中POPs的运转迁移,针对电路板蚀刻废液及其回收后生产的铜盐产品中7种指示性PCBs（多氯联苯）及CB-209进行分析.结果表明,PCBs在碱性废液和微蚀废液中未检出,而在酸性废液中有不同程度检出,ρ（∑8PCBs）在0.41~60.80 ng/L之间,其中ρ（∑7指示性PCBs）在0.24~58.00 ng/L之间.3种铜盐产品〔Cu Cl2、Cu2（OH）3Cl和Cu SO4〕中,Cu SO4中w（∑8PCBs）相对较高,在2.75~284.00 ng/kg之间;而Cu Cl2中w（∑8PCBs）在6.95~31.50 ng/kg之间;Cu2（OH）3Cl中w（∑8PCBs）在7.31~9.42 ng/kg之间.污染物指纹特征表明,酸性蚀刻废液及其铜盐产品中的PCBs具有十分相似的分布特征,CB-28是最主要的检出单体,并且w（CB-209）相对较高,表明铜盐产品中的PCBs主要来源于生产原料（酸性蚀刻废液）的携带,而酸性蚀刻废液中污染物来源须待进一步分析研究.

In order to explore the transport of persistent organic pollutants（ POPs） in the industrial process,polychlorinated biphenyls（ PCBs）,including seven indicator congeners and CB-209,were investigated in the spent etching solutions generated during manufacture of printed circuit boards and its copper salt recycling products.The potential of PCB transport from the spent etching solutions to the copper salts was discussed as well.The samples,including three different spent etching solutions,H2SO4 and three kinds of copper salts,were analyzed by high-resolution gas chromatography/high-resolution mass spectrometry（ HRGC/HRMS） using an isotope-dilution method.The results showed that no evident PCBs were detected in the spent alkaline etching solutions and microetch solutions,while various levels of the contaminants were found in the spent acid etching solutions.ρ（ ∑8PCBs） were in the range of 0.41-60.80ng/L,where ρ（ ∑7PCBs） of the indicator congeners ranged from0.24-58.00 ng/L.Among the copper salts（ Cu Cl2,Cu2（ OH）3Cl and Cu SO4）,relatively higher levels of PCBs were observed in Cu SO4 samples,with w（ ∑8PCBs） of 2.75-284.00 ng/kg,while w（ ∑8PCBs） in Cu Cl2 and Cu2（ OH）3Cl ranged between 6.95-31.50 ng/kg and 7.31-9.42 ng/kg,respectively.The congener profiles showed a similar distribution pattern of PCBs in the spentacid etching solutions and its copper recycling products,where CB-28 was the predominant congener and followed by CB-209.Since CB-209 was not present in the most common Aroclor mixtures and rarely found in the environment,higher levels of CB-209 combined with the similar profiles of indicator PCBs in both spent acid etching solutions and its copper recycling products suggested that PCBs in the copper salts might be mainly transported from the spent acid etching solutions.It is necessary to further investigate the source in spent acid etching solutions.