CAJ | 학술논문

前人研究及国外已有标准表明,一些有机污染物的土壤环境标准的区域差异显著.我国的土壤环境标准正在酝酿之中,研究土壤环境标准的区域差异及其影响因素十分必要.本文选择了取自我国不同地区的13种典型土壤.以萘为例,应用RBCA模型估算了非致癌危害商为1的目标风险水平下,土壤环境中污染物的最高限值,并对取值区域差异的影响因素进行了探讨.结果表明,不同地区土壤中萘的最高限值差异显著,住宅用地萘的最高限值范围为370～1400 mg·kg~(-1),工业用地限值范围为610～4100mg·kg~(-1).不同地区土壤中萘的最高限值差异最高可达3.8～6.7倍.土壤质地和有机质含量是影响最高限值取值的两种主要因素.随着土壤质地粘粒含量的增加,最高限值取值增加,达到一定程度后保持不变或略有降低;随着有机质含量的增加,最高限值取值呈增大趋势,但也有某些情况下,有机质含量增加到一定程度后最高限值趋于稳定.该结果预示了某些有机污染物的土壤环境标准取值受区域变异的影响较大,在标准制修订过程中对此需适当加以考虑.
전인연구급국외이유표준표명,일사유궤오염물적토양배경표준적구역차이현저.아국적토양배경표준정재온양지중,연구토양배경표준적구역차이급기영향인소십분필요.본문선택료취자아국불동지구적13충전형토양.이내위례,응용RBCA모형고산료비치암위해상위1적목표풍험수평하,토양배경중오염물적최고한치,병대취치구역차이적영향인소진행료탐토.결과표명,불동지구토양중내적최고한치차이현저,주택용지내적최고한치범위위370～1400 mg·kg~(-1),공업용지한치범위위610～4100mg·kg~(-1).불동지구토양중내적최고한치차이최고가체3.8～6.7배.토양질지화유궤질함량시영향최고한치취치적량충주요인소.수착토양질지점립함량적증가,최고한치취치증가,체도일정정도후보지불변혹략유강저;수착유궤질함량적증가,최고한치취치정증대추세,단야유모사정황하,유궤질함량증가도일정정도후최고한치추우은정.해결과예시료모사유궤오염물적토양배경표준취치수구역변이적영향교대,재표준제수정과정중대차수괄당가이고필.
Researches and foreign standards clearly illustrated that standards for some organic pollutants in soil varied largely due to regional factors. The current standards of soil environmental quality in China haven't included many organic pollutants yet, and the revision of stan-dards is under discussion. Naphthalene is one of the kinds of all 16 prior PAHs. which is more frequently detected and heavily polluted in contaminated site monitoring. In this study, 13 kinds of typical soil samples from different areas in China were taken, and the maximum toler-able values with an acceptable risk of hazard quotient of 1 for naphthalene in these soils were derived based on RBCA model. Regional vari-ances of the maximum tolerable values for Naphthalene in these soils were discussed. The results showed that, the maximum tolerable values of naphthalene in soils from different areas differed significandy. The range of maximum tolerable values for naphthalene in residential land use was from 370 to 1400 mg·kg~(-1), and was from 610 to 4 100 mg·kg~(-1) for industrial land use. The maximum tolerable values of naphthalenein different areas varied from 3.8 to 6.7 times. Soil texture and organic matter content were the two main factors which influence the maximum tolerable value of naphthalene. The maximum tolerable values of naphthalene firstly increased as the increases of content of clayey particles in soil, and remain unchanged or decreased slighdy when the content of clayey particles increased to a certain extent. The maximum tolerable values of naphthalene also increased with the increase of organic matter content in soil, except for some circumstances, the maximum tolera-ble values of naphthalene went to a peak value and then keep stable when organic matter content in soil reached a certain level. These results indicated that the soil environmental quality standards of some organic pollutants may have a large regional variation. and this variation should be taken into account during development and revision of the soil environmental quality standards in China.