CAJ | 학술논문

以210Pb对广东新丰江水库XFJ-1孔进行了定年,以GC-ECD测定新丰江水库沉积钻孔中DDTs和HCHs的含量,通过对比其剖面变化特征与该类农药在我国的生产、使用历史,探讨了水库中DDT、HCH的历史输入途径.过去30年来,XFJ-1孔平均沉积速率为1.42cm/a,沉积物中HCHs和DDTs的含量分别为1.26-3.90ng/g和1.00-3.96ng/g.DDTs、HCHs含量从20世纪80年代初逐渐下降,总体上与我国1983年开始禁止DDT、HCH的大规模生产和使用这一历史事件相符.DDTs、HCHs及其化合物比值的剖面变化特征均表明:流域内后期土壤侵蚀、搬运的再循环污染物质(即二次污染源)对水库DDT和HCH的贡献不明显;相反,农药历史使用(即一次污染源)是其主要来源,大气沉降是其主要输入途径.此外,γ-HCH、o,p'-DDT和p,p'-DDT含量的垂直变化表明,大规模禁用以后这些化合物仍有少量新的输入,需引起重视.
이210Pb대엄동신봉강수고XFJ-1공진행료정년,이GC-ECD측정신봉강수고침적찬공중DDTs화HCHs적함량,통과대비기부면변화특정여해류농약재아국적생산、사용역사,탐토료수고중DDT、HCH적역사수입도경.과거30년래,XFJ-1공평균침적속솔위1.42cm/a,침적물중HCHs화DDTs적함량분별위1.26-3.90ng/g화1.00-3.96ng/g.DDTs、HCHs함량종20세기80년대초축점하강,총체상여아국1983년개시금지DDT、HCH적대규모생산화사용저일역사사건상부.DDTs、HCHs급기화합물비치적부면변화특정균표명:류역내후기토양침식、반운적재순배오염물질(즉이차오염원)대수고DDT화HCH적공헌불명현;상반,농약역사사용(즉일차오염원)시기주요래원,대기침강시기주요수입도경.차외,γ-HCH、o,p'-DDT화p,p'-DDT함량적수직변화표명,대규모금용이후저사화합물잉유소량신적수입,수인기중시.
Sediment Core XFJ-1 was collected from the Xinfengjiang Reservoir in Guangdong Province,and the samples after coreslicing were dated by the excess 210Pb.Each sediment layer was analyzed for HCH and DDT by equipment of the GC-ECD.The results show a time trend of HCH and DDT in the sediment core so that relationship between the source and transport pathway of these compounds can be discussed.Concentration of HCHs and DDTs in Core XFJ-1 ranges from 1.26 to 3.90ng/g and from 1.00 to 3.96ng/g,respectively.The concentration of HCHs and DDTs declined since the early 1980's,indicating that measures of HCH-and DDT-ban have been effective.Vertical distribution characteristics of HCHs and DDTs show these compounds were not come from the secondary source that was transported by runoff from the basin.The primary source was confirmed as the major source in sediment core,and was input by air dust deposition.Vertical profile of γ-HCH,o,p'-DDT and p,p'-DDT indicate that the compounds still have new input after the ban.