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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Preconcentration by coprecipitation of lead and selenium with Ni/pyrrolidine dithiocarbamate complex and their simultaneous determination by internal standard atomic absorption spectrometry with the solid sampling technique
In situ preconcentration method for trace dissolved sulfide in environmental water samples using solid-phase extraction followed by spectrophotometric determination
Modified extraction procedure for the spectrophotometric determination of trace amounts of aluminium in sea water with pyrocatechol violet and removal of excess of reagent
Spectrophotometric determination of sulphur dioxide by reduction of iron (III) and simultaneous chelation of the iron (II) with 2, 4, 6-tri (2-pyridyl) 1, 3, 5-triazine
Solvent extraction of metal 1, 10-phenanthroline complexes and concentration of trace amounts of metal ions prior to spectrophotometric or flame photometric determination