氯化石蜡产品中短链和中链同系物的指纹分布

Fingerprint patterns of SCCP and MCCP homologues in chlorinated paraffin products

使用气相色谱-电子捕获负化学电离质谱(GC-ECNI-MS),对包含CP-42、CP-52和CP-70三种常见氯含量的22个CPs产品进行了测定,分析了不同氯含量的CPs产品中短链氯化石蜡(SCCPs)和中链氯化石蜡(MCCPs)同系物的分布模式.SCCPs同系物呈现5种分布特征,分别是CP-42型、三类CP-52型和CP-70型,MCCPs同系物呈现4种分布特征,分别是CP-42型和三类CP-52型,CP-70产品中MCCPs同系物未呈现出一致的分布规律.CPs生产原料石蜡中烷烃的成分组成和CPs生产工艺的不同,是造成产品同系物分布模式不一致的原因.通过统计学分析,得到CPs产品中SCCPs和MCCPs同系物的指纹分布,这是开展环境中CPs的源解析、迁移转化、归趋和毒性风险评价等研究的有利工具.

Twenty-two CP products with three chlorine contents (CP-42, CP-52, and CP-70) were determined using gas chromatography coupled with electron capture negative ionization mass spectrometry (GC-ECNI-MS), and the distribution patterns of short chain chlorinated paraffin (SCCP) and medium chain chlorinated paraffin (MCCP) homologues were explored. Five classes of distribution patterns, namely, CP-42 type, three CP-52 types, and CP-70 type were found for SCCP homologues. And four classes of distribution patterns, namely, CP-42 type and three CP-52 types were found for MCCP homologues. MCCP homologues in CP-70 products did not show consistent pattern. The reason for distinct homologue patterns in CP products could be attributed to different composition of alkane in paraffin (raw material) and production process. The fingerprint patterns of SCCP and MCCP homologues in CP products were characterized via statistical analysis, which can be useful tools for studies of source identification, migration and transformation, fate, toxicity risk assessment of CPs in the environment.