表层岩溶带土壤中有机氯农药的分布及来源特征研究——以重庆南川区为例

为了研究有机氯农药(OCPs)在表层岩溶带土壤中的分布趋势、组成特征和来源,采用气相色谱-微池电子捕获检测器(GC-μECD)分析了重庆市南川区水房泉、后沟泉、柏树湾泉、兰花沟泉等典型表层带岩溶泉上覆土层中有机氯农药的浓度。结果显示,总体上表层岩溶带土壤中的OCPs的浓度范围是7.13~323.37ng/g,其中后沟泉、柏树湾泉、兰花沟泉表层土壤中的17种OCPs检出率为100%,水房泉土壤中除p,p'-DDD外其余全部检出,但不同种类有机氯含量差异较大。其中HCHs、DDTs、CHLs、灭蚁灵是主要检出物。研究区内土壤样品中的HCHs来源于工业品HCHs和林丹使用的残留,且由于环境影响,土壤...

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Published in中国岩溶 Vol. 31; no. 1; pp. 23 - 30
Main Author 孙玉川 尚英男 毛海红 付允 沈立成
Format Journal Article
LanguageChinese
Published 西南大学地理科学学院/西南大学三峡库区生态环境教育部重点实验室,重庆,400715%成都市环境保护科学研究院,四川成都,610072 2012
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ISSN1001-4810
DOI10.3969/j.issn.1001-4810.2012.01.005

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Summary:为了研究有机氯农药(OCPs)在表层岩溶带土壤中的分布趋势、组成特征和来源,采用气相色谱-微池电子捕获检测器(GC-μECD)分析了重庆市南川区水房泉、后沟泉、柏树湾泉、兰花沟泉等典型表层带岩溶泉上覆土层中有机氯农药的浓度。结果显示,总体上表层岩溶带土壤中的OCPs的浓度范围是7.13~323.37ng/g,其中后沟泉、柏树湾泉、兰花沟泉表层土壤中的17种OCPs检出率为100%,水房泉土壤中除p,p'-DDD外其余全部检出,但不同种类有机氯含量差异较大。其中HCHs、DDTs、CHLs、灭蚁灵是主要检出物。研究区内土壤样品中的HCHs来源于工业品HCHs和林丹使用的残留,且由于环境影响,土壤中HCH的同系物组成发生了明显变化。水房泉和柏树湾泉土壤中的DDTs来自于工业DDTs和三氯杀螨醇的混合源,而后沟泉和兰花沟泉土壤中的DDTs可能来自于工业DDTs的使用,而非三氯杀螨醇类型的DDT。对比中国和荷兰的土壤质量标准,柏树湾泉土壤中DDTs浓度接近于荷兰无污染土壤的参考值,兰花沟泉土壤中的DDTs应属于轻度污染,后沟泉土壤中的DDTs和氯丹类化合物污染程度较重,而水房泉土壤为无污染土壤。
Bibliography:organochlorine pesticides; epikarst ; soil; composition character ; source recognition
45-1157/P
In order to study the distribution tendency, composition character and main possible sources of organochlorine pesticides (OCPs) in the epikarst soils, the concentrations of OCPs residues in the overlaying soils of four typical epikarst springs are measured by gas chromatography equipped with miro-63 Ni electron capture detector. The four epikarst springs, SF Spring, HG Spring, BSW Spring and LH Spring, situate in Nanchuan District, Chongqing City. The results show that the total OCPs concentrations in the epikarst soils range from 7.13 to 323.37 ng/g, and all 17 OCPs are detected in HG,BSW and LH soils, and except for p, p'-DDD, the other are all detected in SF soil, but the concentrations of different OCPs vary greatly. Accord- ing to the measured concentration, HCHs, DDTs, CHLs and mirex are the most dominant compounds a- mong the 17 OCPs. The composition of HCH indicates HCHs in epikarst soil originating from th
ISSN:1001-4810
DOI:10.3969/j.issn.1001-4810.2012.01.005