Trace element (Se, As, Mo, B) contamination of evaporites in hypersaline agricultural evaporation ponds

Article Abstract:

An investigation of the partitioning of the trace elements Se, As, Mo, B into evaporite minerals formed in hypersaline agricultural evaporation ponds revealed that the trace elements were mainly excluded from the evaporites; hence, the relatively low concentrations of trace elements in the minerals. Trace element partitioning showed no differences between summer and winter, the type of evaporite formed or whether the evaporites were dry or wet when collected. Highly evapoconcentrated agricultural drainage waters may surpass threshold levels for hazardous waste classification of solid and solution products, since trace elements accumulate during the solution phase.

Trace analysis, Water analysis, Trace pollutants, Evaporites, Saline waters, Salt water, Trace elements in water

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Concentration and distribution of metal elements at the surface of balsam fir foliage by micro-proton induced X-ray emission

Article Abstract:

Micro-proton induced X-ray emission scanning was used to investigate metal contamination and spatial distribution at the surface of balsam fir needles from two locations in southern Quebec. Concentrations of Al, Si, Ca, Ti, Fe and Zn at the adaxial surfaces were higher than the average concentrations in whole needles. They were also higher at the near-urban site than at the mountainous location. Accumulation of Mg, Al, Si, K, Mn, Fe and Zn was higher on foliar surfaces and distributions of Mg, K, Mn and Zn deposits at the surface were at needle surfaces.

Plants, Plants (Organisms), Contamination, Firs (Plant), Foliar diagnosis, Fir

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Mississippi River methods comparison study: implications for water quality monitoring of dissolved trace elements

Article Abstract:

The Mississippi River Methods Comparison Study to identify contamination in the river and determine its sources. It reported that the river carries large amounts of suspended iron as dissolved trace elements. Because of the sensation generated by the report, the US Geological Survey'a National Stream Quality Accounting Network launched its own water-monitoring program to verify the initial report. A comparison of results obtained by both studies are discussed.

Measurement, Mississippi River, Water quality, Geological surveys

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