岩矿测试
巖礦測試
암광측시
ROCK AND MINERAL ANALYSIS
2015年
4期
487-493
,共7页
何晗晗%于扬%刘新星%黄凡%赵芝%李超
何晗晗%于颺%劉新星%黃凡%趙芝%李超
하함함%우양%류신성%황범%조지%리초
赣南小流域%溶解性稀土%电感耦合等离子体质谱法%pH值%Eh值
贛南小流域%溶解性稀土%電感耦閤等離子體質譜法%pH值%Eh值
공남소류역%용해성희토%전감우합등리자체질보법%pH치%Eh치
small watershed in South Jiangxi Province%dissolved rare earth elements%Inductively Coupled Plasma-Mass Spectrometry%pH value%Eh value
测试流经稀土矿区河水的pH和Eh值，可以反映矿区的酸碱性、氧化还原环境。本文以赣南地区濂水、桃江、东江流域为研究对象，利用ICP-MS和三通道多参数测试仪分别测试水样中溶解态稀土含量（ DREEs）和pH、Eh值，分析pH、Eh值的变化特征以及DREEs含量与pH值的相关性。结果表明：①研究区水体中DREEs含量变化较大，介于几μg/L至几十mg/L之间；DREEs经球粒陨石标准化后表现为弱的轻稀土富集模式，Eu、Ce显示负异常；②溶解态稀土及La含量分别与pH值呈弱的负相关性，说明地表水体中DREEs浓度及分布模式在一定程度上受外部环境酸碱性的影响；③对于流经地层、地层内离子吸附型稀土矿区的水样，其pH均值分别为7.40、6.94，Eh均值分别为-0.023 V、6.55 mV；对于流经岩体、风化壳离子吸附型稀土矿区的水样，其pH均值分别为6.61、4.37，Eh均值分别为0.024 V、0.15 V，表明赣南地区离子吸附型稀土矿区处于中酸性的氧化环境。
測試流經稀土礦區河水的pH和Eh值，可以反映礦區的痠堿性、氧化還原環境。本文以贛南地區濂水、桃江、東江流域為研究對象，利用ICP-MS和三通道多參數測試儀分彆測試水樣中溶解態稀土含量（ DREEs）和pH、Eh值，分析pH、Eh值的變化特徵以及DREEs含量與pH值的相關性。結果錶明：①研究區水體中DREEs含量變化較大，介于幾μg/L至幾十mg/L之間；DREEs經毬粒隕石標準化後錶現為弱的輕稀土富集模式，Eu、Ce顯示負異常；②溶解態稀土及La含量分彆與pH值呈弱的負相關性，說明地錶水體中DREEs濃度及分佈模式在一定程度上受外部環境痠堿性的影響；③對于流經地層、地層內離子吸附型稀土礦區的水樣，其pH均值分彆為7.40、6.94，Eh均值分彆為-0.023 V、6.55 mV；對于流經巖體、風化殼離子吸附型稀土礦區的水樣，其pH均值分彆為6.61、4.37，Eh均值分彆為0.024 V、0.15 V，錶明贛南地區離子吸附型稀土礦區處于中痠性的氧化環境。
측시류경희토광구하수적pH화Eh치，가이반영광구적산감성、양화환원배경。본문이공남지구렴수、도강、동강류역위연구대상，이용ICP-MS화삼통도다삼수측시의분별측시수양중용해태희토함량（ DREEs）화pH、Eh치，분석pH、Eh치적변화특정이급DREEs함량여pH치적상관성。결과표명：①연구구수체중DREEs함량변화교대，개우궤μg/L지궤십mg/L지간；DREEs경구립운석표준화후표현위약적경희토부집모식，Eu、Ce현시부이상；②용해태희토급La함량분별여pH치정약적부상관성，설명지표수체중DREEs농도급분포모식재일정정도상수외부배경산감성적영향；③대우류경지층、지층내리자흡부형희토광구적수양，기pH균치분별위7.40、6.94，Eh균치분별위-0.023 V、6.55 mV；대우류경암체、풍화각리자흡부형희토광구적수양，기pH균치분별위6.61、4.37，Eh균치분별위0.024 V、0.15 V，표명공남지구리자흡부형희토광구처우중산성적양화배경。
Knowing the pH and Eh values of stream water flowing through the rare earth element deposits can lead to an understanding of the acidity and alkalinity and oxidation-reduction environment of deposits. For this purpose, the Lianshui,Taojiang and Dongjiang rivers in South Jiangxi were selected for study. The dissolved rare earth elements ( DREEs ) and pH-Eh values of water samples were analyzed by Inductively Coupled Plasma-Mass Spectrometry( ICP-MS)and Three-channel Multi-parameter,respectively. Conclusions are listed as follows:(1)DREEs contents range widely from several μg/L to tens of mg/L,and chondrite-normalized DREEs patterns show a slightly right-inclined trend with Eu and Ce negative anomalies. ( 2 )The weakly negative correlations of DREEs and La contents with pH values indicate that the DREEs contents in water and distribution patterns are affected by the pH values of external environment. ( 3 )Stream water samples flowing through stratums and ion-adsorbed type REE deposits in stratums have pH values of 7. 40 and 6. 94,respectively,and Eh values of -0. 023 V and 6. 55 mV,respectively,whereas stream water flowing through granite plutons or weathering crust ion-adsorbed type REE deposits have respective pH values of 6 . 61 and 4 . 37 ,and respective Eh values of 0 . 024 V and 0. 15 V. It indicates that ion-adsorbed type REE deposits formed in a neutral-acid oxidized environment.
