A modified digestion procedure for analysing silver in environmental water samples

Abstract

The low recovery of silver in the analysis of environmental water samples has been experienced for a long time. The major cause was postulated to be due to chloride in the sample that causes precipitation of silver chloride. A modified procedure in which the sample was taken to dryness during acid digestion was proposed to remove chloride. Analysing a surface water sample and a photographic wastewater sample validated this modified procedure.

Simultaneous analysis of 21 elements in foodstuffs by ICP-MS after closed-vessel microwave digestion: Method validation

“…It should be noted that for Ag, mean concentrations (5 and 20 mg L À1 ) were underevaluated in comparison with the theoretical value. The major cause was postulated to be due to chloride in the sample that caused precipitation of silver chloride (Yang et al, 2002). Similar problems were also reported in aqueous samples by US EPA which recommended that samples were digested using mixed acid HNO 3 + HCl (2 + 1) in aqueous samples containing concentrations up to 0.1 mg L À1 of Ag (US EPA, 1994).…”

Validation of a digestion procedure for ICP-AES and dynamic reaction cell ICP-MS for trace elemental analysis in environmental samples

“…Therefore, the proposed mechanism accounting for Sb and Ti losses does not apply to water samples. As for the low recovery of silver, it is hypothesized that the precipitate of AgCl is the cause and it has been previously demonstrated that the loss of Ag from water samples was due to the precipitate of AgCl during the digestion (Yang et al 2002).…”

A magnetic nanoscale metal–organic framework (MNMOF) as a viable fluorescence quencher material for ssDNA and for the detection of mercury ions via a novel quenching–quenching mechanism

“…1,2 So far, many analytical methods have been proposed for the detection of Hg(II) such as atomic absorption spectroscopy, inductively coupled plasma mass/atomic emission spectrometry, ultraviolet (UV)-visible spectroscopy, high-performance liquid chromatography, colorimetric and electrochemical sensors, and so on. [3][4][5][6][7][8] The existing techniques have limitations: they can be time-consuming, and require high-cost instruments and highly skilled personnel. To overcome the drawbacks, nucleic acid-based uorescent sensors have been proposed.…”