摘要
以0.03mol·L-1磷酸和0.1mol·L-1抗坏血酸萃取沉积物样品,以2.0mmol·L-1NaH2PO4和0.2mmol·L-1EDTA(pH=6.0)为流动相,采用高效液相色谱-电感耦合等离子体质谱(HPLC-ICP-MS)联用技术,对大伙房水库表层水体、表层沉积物孔隙水和表层沉积物中的砷元素总量及赋存形态进行检测分析,同时对大伙房库区沉积物粒度进行取样分析.检测结果表明:大伙房水库库区水体及沉积物中砷元素主要以无机砷形态存在,未检测到有机砷形态;表层水体中砷总量较低;表层沉积物孔隙水中只检测到As(Ⅲ),As(V)未检出,且部分采样点砷总量超出国家饮用水标准(10μg·L-1,GB5749—2006),可能会对底栖生物造成影响;表层沉积物中砷总量较高,且As(Ⅲ)含量大于As(V),说明库区沉积环境以还原性条件为主.总体来看,大伙房水库库区水体砷总量较低,但沉积物体系中砷元素总量较高,除R4采样点外均超过国家土壤环境I级标准(GB15618-1995).沿外源河流输入口向库区方向砷总量降低,说明库区砷元素主要来源于外源河流输入,且以浑河为主要来源.
An optimized method for arsenic species quantification in water and surface sediments was established by using HPLC-ICP-MS. An Agilent anion exchange column （G3154- 65001） using 2.0 mmol · L-1 NaH2PO4 and 0.2 mmol · L-1 EDTA solution （pH=6.0） as the mobile phase was introduced to separate arsenic species. Based on this method, arsenic and arsenic species in overlying water, pore water and sediments from the Dahuofang reservoir were investigated. The results showed that arsenic concentrations in overlying water were very low, but arsenic contents in pore water and sediments exceeded the standards for drinking water quality （10 μg · L-1, GB5749—2006） and environmental quality standard for soils （GB15618—1995） of China, respectively. Arsenic species analysis indicated that the environments of the Dahuofang reservoir were in reduced conditions, As（Ⅲ） was the predominant species in pore water and sediments, and no organic species were found in the reservoir. The results also showed that the arsenic in the Dahuofang reservoir was mainly derived from the three major input rivers and the Hun River was responsible for arsenic input to the reservoir.
出处
《环境科学学报》
CAS
CSCD
北大核心
2013年第9期2573-2578,共6页
Acta Scientiae Circumstantiae
基金
国家水体污染控制重大专项(No.2012ZX07503-002)~~
