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Daniel G. Strawn Patrick Hickey Andrew Knudsen Leslie Baker 《Environmental Geology》2007,52(1):109-122
To remediate Pb contaminated soils it is proposed that phosphorus can be amended to the soils to transform the Pb into poorly
soluble Pb-phosphate mineral phases. However, remediation strategies must account for variable Pb speciation and site-specific
factors. In this study soil mineralogy and Pb speciation in soils from P-amended field trials at sites within the Coeur d’Alene
River Basin in Idaho, USA were investigated. The soils are contaminated from mining activities and are enriched with Fe and
Mn. Selective extraction of the soils indicated that the Fe oxides are poorly crystalline. XRD of the soil clay size fractions
identified quartz, muscovite, kaolinite, siderite, lepidocrocite, and chlorite minerals. Amendment with P fertilizer dissolved
the siderite. No Pb–phosphate minerals were detected by XRD. Electron microprobe analysis showed direct correlations between
Pb, Fe, and Mn in the unamended soils, and negative correlations between Pb and Si. Lead and Mn were strongly correlated.
In the amended soils Fe and P were strongly correlated. Results indicate that the Pb is associated with poorly crystalline
Fe and Mn oxides, and that added P is primarily associated with Fe oxide phases. Comparisons of pore water Pb concentrations
with chloropyromorphite and plumbogummite solubility suggest that in the phosphate-amended soils the pore waters are undersaturated
in these phases, whereas several of the control soil pore waters were oversaturated, indicating the added phosphate suppressed
the Pb solubility. Results from this research provide insight into the geochemistry occurring in the P-remediated soils that
will help in making management and remediation decisions. 相似文献
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我国产出的砷铅矿族矿物的研究 总被引:3,自引:0,他引:3
砷铅矿族矿物是一族六方晶系的类质同象系列矿物,包括砷铅矿、钒铅矿和磷氯铅矿。砷铅矿呈淡黄色、浅黄绿色和灰白色六方柱状晶体产出,Hm=3.5,D≥6.75g/cm3,一轴晶负光性,N>2,晶胞参数为a0=1.0251nm,C0=0.744nm,Z=2。广西德保矿区产出的砷铅矿的化学成分为(wt.%):PbO74.94,As2O519.53,P2O52.31,CuO0.36,Cl2.41,总量为99.55。云南个旧矿区产出的钒铅矿呈桔红色至红褐色,六方短柱状自形晶,Hm=3.0,Dx=6.95g/cm3,一轴晶负光性,N>2,晶胞参数为a0=1.031nm,C0=0.743nm,Z=2,空间群为P63/m,其化学成分为(wt.%):PbO79.98,V2O518.94,Cl2.61,总量为101.53。广西阳朔产出的磷氯铅矿,呈暗绿色六方柱状晶体产出,Hm=3.5,D=6.98g/cm3,一轴晶正光性,N=2±,平均化学成分为(wt.%):PbO81.64,P2O515.08,As2O50.10,CuO0.20,Cl2.67,总量为99.69。 相似文献
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