乌鲁木齐地区土壤中有机氯农药残留特征及来源分析

在乌鲁木齐地区,采集了28个表层土壤样品,采用气相色谱法对土壤中有机氯农药残留进行了分析,揭示了乌鲁木齐地区土壤中有机氯农药的残留水平,分布及来源.结果表明,研究区域内土壤中DDTs,HCHs和甲氧滴滴涕均有较高的检出率(68%~93%),是土壤中的主要污染物.乌鲁木齐表层土壤中OCPs的含量在16.40~84.86μg/kg,平均值为(41.89±16.25)μg/kg.有机氯组成特征表明,土壤中有机氯农药残留主要来源于历史上的使用.土壤有机碳是影响有机氯分布的重要因素.与国内外同类研究及中国土壤环境质量标准相比较发现,研究区土壤中DDTs、HCHs的残留均处于较低水平.

Residues and possible sources of organochlorine pesticides in surface soil of Urumqi

Twenty-eight soil samples from Urumqi, China were collected and analyzed for 14 organochlorine pesticides (OCPs). The residues and possible sources of organochlorine pesticides (OCPs) in the soil samples were investigated with gas chromatography. The results showed that HCHs, DDTs and methoxychlor were main contaminations. The total OCPs concentrations in surface soils of Urumqi area ranged from 16.40~84.86 μg/kg with a mean of (41.89±16.25) μg/kg. The composition of OCPs indicated that OCPs in soil sample mainly came from historical application. Soil organic carbon was an important factor in the distribution of OCPs. Compared with the reference date and environmental quality standard for soils of China (GB15618-95), the concentrations of HCHs and DDTs in these samples stayed in a low pollution level.