湖南某地饮用水中多环芳烃的健康风险评价

Health Risk Assessment of Polycyclic Aromatic Hydrocarbons in Drinking Water in a City in Hunan Province

以湖南某地区的饮用水源——某河流流经之处所涉3个乡镇的居民饮用水为研究对象,对水体中16种优控PAHs的质量浓度及其分布特征进行调查,并结合当地人群实际暴露参数进行健康风险评价.结果表明：饮用水中ρ（∑PAHs）平均值为253.13 ngL,分布范围为70.22-673.80 ngL;其中,ρ（萘）和ρ（菲）最高,分别占ρ（∑PAHs）的39%和32%;毒性相对较大的苯并[a]芘的检出率为67.5%,ρ（苯并[a]芘）最高值为8.95 ngL,满足GB 5749—2006《生活饮用水卫生标准》要求;研究区PAHs的致癌风险、一般人群的致癌风险均在可接受范围内,但是塘溪乡居民和其他部分特殊人群（如男性、城市地区和60-79岁人群）的致癌风险均大于10-6,值得关注;研究区PAHs暴露的非致癌风险均小于10-6,在可接受范围内.

The purpose of this research is to study the concentrations,spatial distribution and exposure factor-based human health risks of16 priority PAHs in the drinking water of three towns supplied with drinking water from a river in Hunan Province. Drinking water samples were collected to analyze the PAHs concentrations by GC-MS. The results showed that the total PAHs were in a range of 70. 22-673. 80ng/L,with the average value of 253. 13 ng/L. Among the contents of PAHs,naphthalene and phenanthrene contributed most,accounting for 39% and 32%,respectively. For benzo（ a） pyrene,the highest concentration was 8. 95 ng/L,which meets the national standard for drinking water. The cancer risk of polycyclic aromatic hydrocarbons exposure was below 10- 6. However,for the people from the town of Tangxi,and some special populations,such as men,urban residents,and people aged 60-79,the cancer risk of polycyclic aromatic hydrocarbons was higher than 10- 6. The non-cancer risk of polycyclic aromatic hydrocarbons exposure was below 10- 6.