Modified Walkley-Black method for the determination of Total Organic Carbon (TOC) in ferrous iron rich rock samples and its correlation with Loss-on-Ignition (LOI) | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

6763646

Reference Type

Journal Article

Title

Modified Walkley-Black method for the determination of Total Organic Carbon (TOC) in ferrous iron rich rock samples and its correlation with Loss-on-Ignition (LOI)

Author(s)

Chakraborty, P; Kumar, A; Jain, AK; Lalithambal, R; ,

Year

2013

Is Peer Reviewed?

Yes

Journal

Journal of the Indian Chemical Society
ISSN: 0019-4522

Publisher

SCIENTIFIC PUBL-INDIA

Location

JODHPUR

Page Numbers

2039-2042

Web of Science Id

WOS:000209279800022

Abstract

A modified Walkley-Black (WB) volumetric method for the determination of Total Organic Carbon (TOC) in ferrous rich rock samples has been developed. High amount of ferrous being an interferent in the determination of TOC needs to be removed. The removal of ferrous was carried out using hydrofluoric acid treatment followed by TOC determination by Walkley-Black method. In the present study, the temperature profiling using Muffle furnace was carried out to ascertain the loss of organic matter by combustion and correlate the TOC values as obtained by modified Walkley-Black method. This combustion technique and the modified method was applied on black shale samples obtained from Loharka, Dehardun area and few synthetic samples rich in ferrous ions. Study regarding temperature profile of high ferrous and black shale samples done by a temperature controlled Muffle furnace, suggests that, the fraction of weight loss between 450 to 500 degrees C corresponds to the TOC values. The values obtained by both the methods were in good agreement with the values obtained from TOC analyser.