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Optimization of Dry ashing of Whole Blood Samples for Trace Metal Analysis

American Journal of Analytical Chemistry 2011年第8期2卷 979-983页

作者： Stefanie A. Bragg Zi-Ling Xue 不详

Dry ashing is an established method. ashing whole blood samples are, however, often difficult to carry out with significant sample loss, and the procedure is not well documented. A new procedure has been devel- oped and optimized to dry-ash whole blood samples for trace metal analyses. The procedure reduces both the dry-ashing time by more than two thirds and sample loss. The ashed sample can be readily used in subse- quent, simultaneous or individual analysis of several metals by ICP-OES, as demonstrated in the analysis of a whole blood sample. The new procedure is simple, inexpensive, and faster than the established method.

关键词： Dry ashing Blood Samples Trace Metal Analysis

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Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique

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Journal of Earth Science 2022年第1期33卷 76-81页

作者： Jin Li Xiangkun Zhu Suohan Tang MNR Key Laboratory of Isotope Geology MNR Key Laboratory of Deep-Earth DynamicsInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China

This study investigates the behavior of Mo and Mo isotopes (δ^(98)Mo) in shales following leaching with HCl and HNO_(3) with the aim of simplifying the shale dissolution *** to 6%of the Mo was lost and the Mo isotopes were unaffected when shales were leached using 9 M HCl after *** sample digestion or leaching by 4 M or more concentrated HCl after ashing were all found to be acceptable and reliable approaches to the analysis of Mo isotopes in *** black shale (CAGS-BS) was leached with 2 M HCl,1 M HCl,and 9 M HNO_(3),the Mo concentration ([Mo]) in the leachate was lower and δ^(98)Mo was heavier than that obtained from bulk digestion.A Mo isotope mass-balance model showed that the δ^(98)Mo in the residues was lighter than the δ^(98)Mo from the bulk digestion of CAGS-BS and of crustal igneous *** more Mo was lost,nor did Mo isotope fractionation,if the double spike was added before rather than after ashing and followed by bulk digestion or leaching with 9 M *** efficiency,leaching using 4 M or more concentrated HCl after ashing is preferred for Mo isotope measurements.

关键词： Mo isotopes double spike ashing bulk digestion leaching

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Development of Moisture and Ash Based Correlation for the Estimation of Mineral Matter in High Ash Indian Coal

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International Journal of Clean Coal and Energy 2015年第2期4卷 33-42页

作者： M. K. Saini P. K. Srivastava N. Choudhury Resource Quality Assessment CSIR-Central Institute of Mining & Fuel Research Regional Center Ranchi India Applied Chemistry Birla Institute of Technology Regional Center Deoghar India Resource Quality Assessment CSIR-Central Institute of Mining & Fuel Research Digwadih Campus Dhanbad India

The experimental determination of mineral matter in coal is a tedious as well as time consuming process, and requires highly skilled analyst to carry out the chemical analysis of coal and ash. On the other hand, determination of moisture and ash is relatively easy using moisture oven and muffle furnace and can be determined anywhere with little care. Most of the methods reported till date for the evaluation of mineral matter in coal involves indirect determination of mineral matter using high temperature ash as one parameter. All these methods offer conversion of ash yield into mineral matter with the help of correlations based on certain assumptions. Although, the method for direct determination of mineral matter by chemical analysis is also reported, but is of little use as it requires extensive chemical analysis. In this study mineral matter is determined directly by oxygen plasma asher in coal samples collected from different regions of India. The results obtained were compared with those obtained by existing correlations. It has been observed that all the existing correlations including Parr’s, are found to be unrealistic for high ash Indian coal. An attempt has been made to develop a new correlation for the estimation of mineral matter based on two simple parameter i.e. moisture content and ash yield. Present model was developed after analyzing 75 coal samples. The developed correlation appears to be more simple and better and is represented as Mineral Matter(MM)= 0.74(Moisture) + 1.17(Ash)

关键词： Ash Yield Low Temperature ashing Mineral Matter Moisture Content

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