Determination of lead by hydride generation atomic absorption spectrometry (HGAAS) using a solid medium for generating hydride

Abstract

A new method of hydride generation was used for the determination of lead at ng mL−1 levels by atomic absorption spectrometry (AAS). Lead hydride was generated at 65 °C using solid sodium borohydride and solid tartaric acid. The limit of detection was 4.5 ng mL−1 Pb. The calibration curve was linear from 50 to 1000 ng mL−1. The relative standard deviations of 10 replicate determinations of 500 ng mL−1 and 200 ng mL−1 Pb2+ were 2.05 and 4.00%, respectively. The effect of some transition metals on the determination of lead was also investigated. The reliability of the method was evaluated by determining the lead contents of different soil, earthenware, and synthetic samples. niques such as ultrasonication and microwave irradiation.

Determination of lead by hydride generation atom trapping flame atomic absorption spectrometry

“…22 Both nitric and lactic acids improved efficiency in the presence of (NH 4 53 Precision was poor when HCl was used with Na 2 S 2 O 8 . 53 Conversely, HCl was the most suitable acid with K 3 Fe(CN) 6 , a relatively mild oxidant.…”

“…22 Both nitric and lactic acids improved efficiency in the presence of (NH 4 53 Precision was poor when HCl was used with Na 2 S 2 O 8 . 53 Conversely, HCl was the most suitable acid with K 3 Fe(CN) 6 , a relatively mild oxidant. [28][29][30][31] In this study, HCl-K 3 Fe(CN) 6 acid-oxidant medium was used as it has been frequently reported to provide by far the highest sensitivity in the generation of lead hydride.…”

A Simple and Sensitive Flow-Injection On-line Preconcentration Coupled with Hydride Generation Atomic Fluorescence Spectrometry for the Determination of Ultra-trace Lead in Water, Wine, and Rice

“…The tolerance limits (mg l -1 ) of foreign ions or substances on the signal of a 1.0 μg l -1 Pb standard, defined as the interferent concentration varying the analyte signal by 10%, are presented as follows: Ca III and Mn II in the present work were greatly improved compared with other reported procedures. 28,29 One reason for this improvement is attributed to the advantages of FI on-line operation, i.e., minimizing the contact time between the lead hydride and the interfering species. 19,30 Another reason might be the use of NH3-NH4Cl as a precipitant, which would cause the analyte to be separated from the matrix, and would also mask some metal ions, such as Cu, Co, Zn and Ni, by forming the complexes.…”

Determination of lead in wine and rum samples by flow injection-hydride generation-atomic absorption spectrometry

“…Generation of lead hydride depends largely on the experimental conditions used, therefore, previous studies have mainly focused on the nature of the acids and oxidizing agents, and their roles in the generation of plumbane. Most common oxidizing agents used in presence of various acids include hydrogen peroxide [6][7][8][9], ammonium or sodium peroxodisulphate [6,10,11], potassium dichromate [6,8,11] and potassium ferricyanide [11,12]. Depending on the type of oxidizing agent, it was reported that the use of acidic oxidizing media increased the reaction rate and sensitivity via efficient oxidation of Pb(II) to an unstable intermediate, Pb(IV), to form plumbane, PbH 4 , [5,6,13,14].…”