Arsenic Determination in Marine Sediment Using Ultrasound for Sample Preparation

Abstract

This work deals with As determination in marine sediment using ultrasound for sample preparation. It is shown that As can be quantitatively extracted from marine sediment using 20% (v/v) HCl and sonication. The slurry is centrifuged and the analyte is determined in the supernatant by hydride generation atomic absorption spectrometry (HG AAS). A flow injection (FI) system is employed for hydride generation, with 0.5% (m/v) NaBH4 used as reducdant and a 20% (v/v) HCl used as sample carrier. The limit of quantification is 1.6 μg g -1 of As, which is based on 800 μl of sample solution and 0.200 g of sample mass in a volume of 50 mL. Certified and non certified marine sediment samples were analyzed; the results were in accordance with the certified or reference values. Speciation analysis by HPLC-ICP-MS showed that As(V) is the only detectable As species present in the supernatant of the centrifuged sample.

Atomic spectrometry update. Advances in atomic emission, absorption, and fluorescence spectrometry, and related techniques

“…If the As is on the surface of the particles, then total dissolution should not be necessary and relatively mild extractants can be used. Bentlin et al 162 dissolved As in marine sediment by sonication in 20% (v/v) HCl followed by HG-AAS determination. For a sample mass of 0.200 g in 50 mL and an injection volume of 800 mL, the LOQ was 2 mg g À1 .…”

Ultrasound assisted extraction for the determination of mercury in sediment samples employing cold vapour atomic absorption spectrometry

“…3,4 Bentlin et al proposed an extraction procedure using an ultrasound probe for the quantitative extraction of inorganic arsenic species in marine sediment samples. The experimental conditions optimized proposed a sample mass from 50 to 500 mg, 20% (v/v) hydrochloric acid solution, and a sonication time of 30 s using a probe with a power of 80 W. 5 Garcia-Casillas et al evaluated the use of an ultrasound probe as an alternative to the conventional standard procedures of metal ion extraction in soils using the following solutions: 0.01 M calcium chloride, 0.43 M acetic acid and 0.05 ethylenediaminetetraacetic acid at pH 7.0. The results demonstrated that the extraction time using calcium chloride solution was reduced from 3 h (conventional procedure) to 2 min using the probe.…”

A miniaturized cryogenic trap design for collection of arsanes

“…Arsenic determination plays an important role in the analysis of environmental samples [1][2][3][4][5][6][7][8][9][10]. Metabolism studies of arsenic are widely performed [11][12][13][14][15][16] as well as toxicity studies of arsenic species [17][18][19].…”