6533b826fe1ef96bd12845cb

RESEARCH PRODUCT

Multi-elemental determination of heavy elements in plastics using X-ray fluorescence after destruction of the polymer by molten sodium hydroxide

F. Bosch ReigM.t. Doménech CarbóV. Peris MartinezJ. V. Gimeno Adelantado

subject

Calibration curveSodiumInorganic chemistrychemistry.chemical_elementX-ray fluorescenceBariumBiochemistryAnalytical Chemistrychemistry.chemical_compoundchemistryAntimonySodium nitrateSodium hydroxideSodium diethyldithiocarbamate

description

In this paper a method is proposed for the multielemental analysis of Sb(III), Ba, Cd, Cr(III), Hg, Pb and As(III) in plastics, using X-ray fluorescence after alkaline decomposition and preconcentration by (co)precipitation. The organic matrix is destroyed by decomposition with sodium hydroxide melted in a silver crucible by the open system technique, using sodium nitrate as auxiliary oxidant. The variables which influence preconcentration are optimized: digestion time, pH, salinity, carrier and sodium diethyldithiocarbamate (DDTC) and sodium rhodizonate (R) as precipitants. The calibration curves were linear up to 200 μg of the element present, except for lead (150 μg) antimony(III) (100 μg) and barium (1000 μg). The proposed method has been applied to several different industrial plastics. The procedure is quick and leads to results comparable with those obtained when using a recommended decomposition for each element separately.

yearjournalcountryeditionlanguage
1992-01-01Fresenius' Journal of Analytical Chemistry
https://doi.org/10.1007/bf00321918