Study on the Availability of Wet Chemical Digestion of Geo-electrochemical Polyurethane Foam Samples

Hong-ze YAN; Hai-jie CHEN; Bin-bin SUN; Guo-hua ZHOU; Ling HE; Yin-fei LIU; Teng-yun WANG

doi:10.15898/j.cnki.11-2131/td.201610050150

Rock and Mineral Analysis > 2017 > 36(5): 510-518. > DOI: 10.15898/j.cnki.11-2131/td.201610050150

Hong-ze YAN, Hai-jie CHEN, Bin-bin SUN, Guo-hua ZHOU, Ling HE, Yin-fei LIU, Teng-yun WANG. Study on the Availability of Wet Chemical Digestion of Geo-electrochemical Polyurethane Foam Samples[J]. Rock and Mineral Analysis, 2017, 36(5): 510-518. DOI: 10.15898/j.cnki.11-2131/td.201610050150

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Study on the Availability of Wet Chemical Digestion of Geo-electrochemical Polyurethane Foam Samples

Hong-ze YAN^1,2,3,,
Hai-jie CHEN^1,2,
Bin-bin SUN^1,2, ,,
Guo-hua ZHOU^1,2,
Ling HE^1,2,
Yin-fei LIU^1,2,3,
Teng-yun WANG^1,2,3

1.
Key Laboratory of Geochemical Exploration, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
2.
International Center on Global-scale Geochemistry, United Nations Educational Scientific and Cultural Organization, Langfang 065000, China
3.
School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Received Date: October 04, 2016
Revised Date: July 13, 2017
Accepted Date: August 13, 2017
Published Date: August 31, 2017

Abstract

Highlights
· The system of nitric acid-perchloric acid-aqua regia is attempted to decompose the geo-electrochemical polyurethane foam samples.

· The adverse factors such as explosion is avoided when using perchloric acid to dissolve foam samples.

· The pretreatment method of geo-electrochemical polyurethane foam samples is evaluated based on the exploration effect.

ABSTRACT

As the pretreatment methods in analyzing geo-electrochemical polyurethane foam samples, ashing and microwave digestion methods are suitable for determination of most elements. Both methods have their disadvantages. The ashing method may cause volatilization loss of some elements (e.g. Hg, As) under high temperature, whereas issues about sample representation and detection limit exist in the microwave digestion method because of the small amount of sample (0.1 g). Wet chemical digestion is a traditional pretreatment method, which is widely used in the pretreatment of various geochemical samples and has the advantages of complete digestion, low element loss and good sample representation. However, because of the problems of explosion and acid blank during digestion of polyurethane foam (organic) samples, this method has not been used in pretreatment of geo-electrochemical foam samples. For this study a geo-electrochemical exploration line in Luokedun hydrothermal lead-zinc polymetallic deposit in Inner Mongolia was selected as the research subject. 20 mL of Nitric acid, 5 mL of perchloric acid, and 5 mL of aqua regia were used to digest 0.5 g foam samples. The contents of some related elements were determined by High-resolution Inductively Coupled Plasma-Mass Spectrometry (HR-ICP-MS) and Atomic Fluorescence Spectrometry (AFS). Results show that contents of the foam blank are relatively low for most elements, and the geochemical profiles show good anomalies. It is suggested that wet digestion is feasible in the analysis of geo-electrochemical polyurethane foam samples, and could be used widely in the future.

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