Application of flow injection on-line electrothermal atomic absorption spectrometry to the determination of rhodium.
A fully automated procedure for the determination of rhodium has been developed using flow injection (FI) on-line microcolumn preconcentration coupled with electrothermal atomic absorption spectrometry (ETAAS). The proposed FI manifold and its operation make possible the introduction of the total eluate volume into the graphite atomizer, avoiding the necessity for optimisation of subsampling the eluate. Rhodium is adsorbed on a microcolumn packed with 1,5-bis(di-2-pyridyl)methylene thiocarbohydrazide immobilized on silica gel (DPTH-gel). Under the optimum conditions, using a 60 s preconcentration time, a sample flow rate of 3.5 mL min(-1) and an injection volume of eluent of 50 microL, a linear calibration graph was obtained from 1 to at least 40 ng mL(-1) and the detection limit was 1 ng mL(-1). The proposed method has been successfully applied to the analysis of samples. Its performance was investigated against certified reference catalyst sample SRM-2557 and by recovery measurements on spiked samples (soil, foods and beverages).
Sanchez Rojas
Fuensanta
F
Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, 29071 Málaga, Spain. fsanchezr@uma.es
Bosch Ojeda
Catalina
C
Cano Pavón
José Manuel
JM
D001331:Automation; D001628:Beverages; D004784:Environmental Monitoring / Q000379:methods; D005502:Food; D012016:Reference Values; D012238:Rhodium / Q000032:analysis*; D012987:Soil; D013054:Spectrophotometry, Atomic
D012987:Soil; D012238:Rhodium