Determination of thallium at trace levels by electrolyte cathode discharge atomic emission spectrometry with improved sensitivity

摘要: An analytical method using electrolyte cathode discharge atomic emission spectrometry (ELCAD-AES) has been described for the trace determination of thallium after improving its sensitivity. Parameters influencing sensitivity are investigated at wavelength 377.572 nm. Maximum enhancement is obtained with combination a surfactant (Triton X-114) and potassium iodide. Sensitivity improved 12 times use an optimised composition 3.5% v/v Triton X-114 0.2% w/v KI. Under optimized conditions, achieved detection limit 1 μg L−1 which 100 better compared to without addition The precision 2% 500 concentration. accuracy proposed validated by analyzing NIST 1633b coal fly ash certified reference material IAEA 394 material. On comparison, ELCAD-AES results found be in agreement values high resolution continuum source graphite furnace absorption (HR-CS-GFAAS). 134 ng g−1. Determinations spiked levels ground water samples carried out HR-CS-AAS each other.