8/14/2019 Estimation of Arsenic in Soil Samples

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ESTIMATION OF ARSENIC IN SOIL SAMPLES

A method for the on-site estimation of arsenic (As) contamination in soil by solid-phase

extraction with a resin based on molecular recognition technology (SPE-MRT) andanodic stripping voltammetry (ASV) using a gold film microelectrode was developed.

Optimized pretreatments were carried out as follows: 1 g of soil sample was taken andput into polypropylene test tube containing 33 mL 1 M hydrochloric acid solution, which

was heated at 70 degree Celsius for 5 min using graphite block hot plate. As in thesample was extracted by shaking for 1 min using an automatic mini-shaker system. The

extract was finally filtered through a 0.45 m disk PTFE membrane filter. The extracted

arsenic was electrodeposited on the gold film carbon microelectrode at -400 mV vs. Ag /AgCl for 1 min and the deposits were stripped at a rate of 5 mV / s to 580 mV vs. Ag /

AgCl by using AnaLig TE-3, Cu in soil extract was removed with 1 M hydrochloric

acid for the determination of As. The method can eliminate Cu interference. Thedetection limit was 0.5 g / L in soil extract. The results of voltammograms for As in the

extracts from real soil samples were the same level as these obtained by a cross-check

method using inductively coupled plasma mass spectroscopy (ICP -MS).

A method for the on-site estimation of arsenic (As) contamination in soil by solid-phaseextraction with a resin based on molecular recognition technology (SPE-MRT) and

anodic stripping voltammetry (ASV) using a gold film microelectrode was developed.

Optimized pretreatments were carried out as follows: 1 g of soil sample was taken andput into polypropylene test tube containing 33 mL 1 M hydrochloric acid solution, which

was heated at 70 degree Celsius for 5 min using graphite block hot plate. As in the

sample was extracted by shaking for 1 min using an automatic mini-shaker system. The

extract was finally filtered through a 0.45m disk PTFE membrane filter. The extractedarsenic was electrodeposited on the gold film carbon microelectrode at -400 mV vs.

Ag/AgCl for 1 min and the deposits were stripped at a rate of 5 mV/s to 580 mV vs.Ag/AgCl by using AnaLig^[!R] TE-3, Cu in soil extract was removed with 1 Mhydrochloric acid for the determination of As. The method can eliminate Cu interference.

The detection limit was 0.5g/L in soil extract. The results of voltammograms for As in

the extracts from real soil samples were the same level as these obtained by a cross-checkmethod using inductively coupled plasma mass spectroscopy (ICP-MS). A method for the

on-site estimation of arsenic (As) contamination in soil by solid-phase extraction with a

resin based on molecular recognition technology (SPE-MRT) and anodic stripping

voltammetry (ASV) using a gold film microelectrode was developed. Optimizedpretreatments were carried out as follows: 1 g of soil sample was taken and put into

polypropylene test tube containing 33 mL 1 M hydrochloric acid solution, which was

heated at 70 degree Celsius for 5 min using graphite block hot plate. As in the samplewas extracted by shaking for 1 min using an automatic mini-shaker system. The extract

was finally filtered through a 0.45m disk PTFE membrane filter. The extracted arsenic

was electrodeposited on the gold film carbon microelectrode at -400 mV vs. Ag / AgClfor 1 min and the deposits were stripped at a rate of 5 mV / s to 580 mV vs. Ag / AgCl by

using AnaLig ^ [! R] TE-3, Cu in soil extract was removed with 1 M hydrochloric acid

for the determination of As. The method can eliminate Cu interference. The detectionlimit was 0.5g / L in soil extract. The results of voltammograms for As in the extracts

from real soil samples were the same level as these obtained by a cross-check method

using inductively coupled plasma mass spectroscopy (ICP-MS).