人民黄河
人民黃河
인민황하
Yellow River
2015年
2期
78-80
,共3页
砷含量%重金属污染%沉积物%黄河内蒙古段
砷含量%重金屬汙染%沉積物%黃河內矇古段
신함량%중금속오염%침적물%황하내몽고단
arsenic concentration%heavy metal pollution%sediment%Inner Mongolia section of Yellow River
为探明黄河内蒙古段沉积物中砷含量及形态分布特征,采集黄河内蒙古段干流柱状沉积物,采用 HNO4-H2 SO4-HClO4法消解沉积物样品,提取沉积物中吸附型砷(A-As)、铝型砷(Al-As)、铁型砷(Fe-As)、钙型砷(Ca-As)、包蔽型砷(O-As)5种形态砷,并采用氢化物发生原子荧光分光光度法测定砷含量。结果表明:黄河内蒙古段干流柱状沉积物中砷含量为7.123~16.661 mg/kg,平均为9.292 mg/kg;从整体上看,左岸沉积物砷含量高于右岸,随深度增加砷含量呈下降趋势,从上游至下游砷含量在黑柳子段出现高值;黄河内蒙古段沉积物中砷以Ca-As为主,O-As次之;随着深度的增加,总体上,Ca-As含量略有升高,A-As和O-As含量有所下降,Al-As和Fe-As含量基本不变。
為探明黃河內矇古段沉積物中砷含量及形態分佈特徵,採集黃河內矇古段榦流柱狀沉積物,採用 HNO4-H2 SO4-HClO4法消解沉積物樣品,提取沉積物中吸附型砷(A-As)、鋁型砷(Al-As)、鐵型砷(Fe-As)、鈣型砷(Ca-As)、包蔽型砷(O-As)5種形態砷,併採用氫化物髮生原子熒光分光光度法測定砷含量。結果錶明:黃河內矇古段榦流柱狀沉積物中砷含量為7.123~16.661 mg/kg,平均為9.292 mg/kg;從整體上看,左岸沉積物砷含量高于右岸,隨深度增加砷含量呈下降趨勢,從上遊至下遊砷含量在黑柳子段齣現高值;黃河內矇古段沉積物中砷以Ca-As為主,O-As次之;隨著深度的增加,總體上,Ca-As含量略有升高,A-As和O-As含量有所下降,Al-As和Fe-As含量基本不變。
위탐명황하내몽고단침적물중신함량급형태분포특정,채집황하내몽고단간류주상침적물,채용 HNO4-H2 SO4-HClO4법소해침적물양품,제취침적물중흡부형신(A-As)、려형신(Al-As)、철형신(Fe-As)、개형신(Ca-As)、포폐형신(O-As)5충형태신,병채용경화물발생원자형광분광광도법측정신함량。결과표명:황하내몽고단간류주상침적물중신함량위7.123~16.661 mg/kg,평균위9.292 mg/kg;종정체상간,좌안침적물신함량고우우안,수심도증가신함량정하강추세,종상유지하유신함량재흑류자단출현고치;황하내몽고단침적물중신이Ca-As위주,O-As차지;수착심도적증가,총체상,Ca-As함량략유승고,A-As화O-As함량유소하강,Al-As화Fe-As함량기본불변。
Concentration and species distribution of arsenic in the Yellow River sediment cores in Inner Mongolia section were researched. Sediment was digested by HNO4 -H2 SO4 -HClO4 ,arsenic in sediments was divided into five fractions such as A-As、Al-As、Fe-As、Ca-As and O-As and extracted by sequential extraction procedure. Arsenic concentrations were determined by hydride generation atomic flu-orescence spectrophotometry. The results show that the total arsenic concentrations is 7. 123-16. 661 mg/kg,averagely 9. 292 mg/kg. Loo-king from the whole,arsenic concentration of the left bank is higher than those of the right bank. Arsenic concentration in sediment is de-creased with the increase of depth and reaches the highest level at Heiliuz along the river. Arsenic in the sediments is mainly in Ca-As and secondly in O-As. With the increase of depth,the percentage of Ca-As is increased slightly,the percentage of A-As and O-As is de-creased,Al-As and Fe-As are basically unchanged.