scholarly journals Efficiency of acid digestion procedures for geochemical analysis of tungsten mining wastes

2021 ◽  
pp. geochem2021-034
Author(s):  
Z. Han ◽  
M. Edraki ◽  
A. Nguyen ◽  
M. Mostert
Keyword(s):  
Trace Element Analysis ◽  
Major Elements ◽  
Critical Element ◽  
Digestion Method ◽  
Element Analysis ◽  
Geochemical Composition ◽  
Alkali Fusion ◽  
Global Demand ◽  
Complete Digestion ◽  
Digestion Methods

Tungsten is a critical element used in the industry with increasing global demand. There are millions of tons of current and legacy mineral processing tungsten tailings worldwide that can potentially contaminate the environment and pose human health risks. These tailings could also potentially turn into valuable resources if we thoroughly characterise their geochemical composition. In this study, an innovative method was developed to achieve the complete digestion of tungsten tailings. We tested three different digestion methods (hotplate digestion, bomb digestion, and ColdBlockTM digestion) and compared the results. Additionally, an alkali fusion for major element analysis was also applied and tested. The results showed that alkali fusion is the best method for major elements analysis, while bomb digestion is the best method for tungsten and trace element analysis, but volatile chlorite loss was also observed. The hot plate digestion method for tungsten mine tailings was not recommended, because of poor recoveries of trace elements compared to the bomb digestion method. The quick and safer ColdBlockTM digestion method could be used for Bismuth (Bi), Molybdenum (Mo), and several rare earth element analyses indicated by their recoveries being close to the bomb digestion method. 

Trace Element Analysis of Rocks by X-ray Spectrometry

1990 ◽  
Vol 34 ◽  
pp. 263-276 ◽  
Author(s):  
Bruce W. Chappell
Keyword(s):  
Trace Element ◽  
Trace Element Analysis ◽  
Major Elements ◽  
Good Precision ◽  
Powerful Method ◽  
Element Analysis ◽  
X Ray ◽  
Advantages And Disadvantages ◽  
Wide Range ◽  
Unique Method

Undoubtedly the most important applications of X-ray fluorescence spectrometry (XRF) have been in the analysis of major elements where the technique provides a unique method of measuring the concentration of all elements having Z > 10 with extremely good precision in a wide range of matrices. However, XRF is in addition a powerful method for trace element analysis. In this discussion, the principles of the method for the trace element analysis of rocks are outlined, its capabilities are summarized, and the advantages and disadvantages of the technique are pointed out.

SHORT COMMUNICATION: A comparison of plant tissue digestion methods for nitrogen and phosphorus analyses

1995 ◽  
Vol 75 (2) ◽  
pp. 243-245 ◽  
Author(s):  
Y. K. Soon ◽  
Y. P. Kalra
Keyword(s):  
Plant Tissue ◽  
Nitrogen And Phosphorus ◽  
Digestion Method ◽  
Element Analysis ◽  
Dry Ashing ◽  
Kjeldahl Digestion ◽  
Digestion Methods ◽  
Multi Element Analysis ◽  
Nitrogen Phosphorus ◽  
Tissue Digestion

Four variations of the Kjeldahl digestion were compared with a H2SO4–H2O2 digestion for N and P analysis, and a microwve digestion method and a dry ashing procedure for P analysis. One Kjeldahl variant using a Na2SO4–Se catalyst was found to be suitable for multi-element analysis while doubling the per diem output of digestions compared with the H2SO4–H2O2 method, provided that P was analyzed by the molybdivanadate (MV) procedure. Key words: Kjeldahl digestion, nitrogen, phosphorus, plant tissue

Comparison of methods for inorganic trace element analysis in croatian olive oils

2008 ◽  
Vol 56 (1) ◽  
pp. 33-40 ◽  
Author(s):  
I. Juranović Ćindrić ◽  
M. Zeiner ◽  
I. Steffan
Keyword(s):  
Trace Element Analysis ◽  
Comparison Of Methods ◽  
Closed Vessel ◽  
Digestion Method ◽  
Element Analysis ◽  
Microwave Assisted ◽  
Olive Oils ◽  
Relative Standard ◽  
Microwave Assisted Digestion

The aim of the present study was a comparison of the analytical methods optimized for the determination of trace elements in olive oils as a basis for further investigations, such as adulteration detection or geographical characterization.Different types of sample preparation procedures prior to ICP-AES and GFAAS determinations were investigated: both open and closed vessel digestion in a steel bomb, as well as microwave-assisted digestion using a closed system, which was selected for further investigations. Recoveries for all elements in olive oil were > 95%. Good reproducibility (up to 10% RSD) was achieved for the measurements of the elements analysed. The sensitivity of the ICP-AES technique was sufficient for the determination of Ca, Fe, Mg and Zn (relative standard deviation approx. 2%). Furthermore, the proposed digestion method allowed the GFAAS determination of Al, Co, Cu, K and Ni in the concentration range of 0.1 to 1.5 μg/g, with relative standard deviations of approximately 3 to 10% for all samples.

Elemental Analysis of Geological Samples Using a Multichannel, Simultaneous X-Ray Spectrometer

1982 ◽  
Vol 26 ◽  
pp. 451-456
Author(s):  
J. B. Cross ◽  
L. V. Wilson
Keyword(s):  
Sample Preparation ◽  
Elemental Analysis ◽  
Trace Element Analysis ◽  
Major Elements ◽  
Geological Samples ◽  
Element Analysis ◽  
X Ray ◽  
Large Numbers ◽  
Key Factor

X-ray spectrometry has been used successfully for major and trace element analysis of geological samples (e.g. reference 1). Its advantage is providing accurate and precise results in a rapid manner: a key factor in selecting analytical methods for mineralogical studies involving large numbers of samples. All elements with atomic numbers greater than 9 (fluorine), except noble gases, can be determined with sensitivities ranging down to ppm levels.The analytical method described in this report is for the determination of the major elements (i.e. Na, Mg, Al, Si, P, K, Ca, Ti, Mn and Fe) in geological samples. Commercially available automated fusion devices are used for sample preparation.

scholarly journals Revisited digestion methods for trace element analysis in human hair

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Woo-Jin Shin ◽  
Minkyoung Jung ◽  
Jong-Sik Ryu ◽  
Jihwan Hwang ◽  
Kwang-Sik Lee
Keyword(s):  
Trace Elements ◽  
High Temperature ◽  
Human Hair ◽  
Recovery Rate ◽  
Human Mobility ◽  
Trace Element Analysis ◽  
High Volume ◽  
Element Analysis ◽  
Precise Data ◽  
Digestion Methods

Abstract Background The human hair is a potential material for assessing the exposure to environmental contaminants and tracing human mobility. Although various digestion methods have been proposed for determining trace elements in the human hair, there is no consensus about the best method among them yet. Findings We examined five different methods in order to determine the best method yielding the most accurate and precise data of trace elements in the human hair using two certified reference human hairs (IAEA085 and IAEA086) under controlled conditions (temperature, the volume of hydrogen peroxide (H2O2), and the number of digestion). Results showed that a high temperature of 160 °C yields better recovery rates than a low temperature of 70 °C. Furthermore, the additional input of H2O2 increases the recovery rate from 90 to 102%, and the two-time digestion also promotes the recovery rate. Conclusions This study suggests that although the combination of high temperature (160 °C), high volume of H2O2 (0.4 mL), and two-time digestion yields the most accurate and precise data of trace elements in the human hair, the digestion method should be carefully selected depending on the content of organometallic cation.

Is volcanic ash responsible for the enrichment of organic carbon in shales? Quantitative characterization of organic-rich shale at the Ordovician-Silurian transition

2020 ◽  
Author(s):  
Ke Zhao ◽  
Xuebin Du ◽  
Yongchao Lu ◽  
Fang Hao ◽  
Zhanhong Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Primary Productivity ◽  
Volcanic Ash ◽  
Trace Element Analysis ◽  
Nutrient Content ◽  
Major Elements ◽  
Redox Conditions ◽  
Element Analysis ◽  
High Productivity

Subaerial volcanism and atmospheric volcanic ash deposition have been recognized as factors that can greatly affect the nutrient content of the surface ocean and the redox conditions of the water column. Black siliceous, organic-rich mudstone and shale containing numerous volcanic ash layers were deposited in the South China Block during the Ordovician-Silurian transition. Although this association has been observed in other regions, whether there is a relationship between volcanic ash and the organic carbon contents and the effect of volcanic ash remains unclear. Based on analysis of the concentrations of major elements, trace elements, and total organic carbon in the volcanic ash and shale, we found that anoxic and high-productivity environments existed during the Ordovician-Silurian transition and that organic matter was preferentially preserved under these conditions. For the volcanic ash, we quantitatively estimated the depletion of the nutrient elements Fe, Si, and P (in percentages). The calculated results show that leaching removed 25−75% of the Fe, Si, and P in most of the ash samples in the study area, potentially leading to high marine primary productivity in the surface water. Redox conditions also played a major role in the preservation of organic matter. The trace element analysis results show that although productivity was high during the Ordovician-Silurian transition, organic matter was preferentially preserved in the Lower Silurian strata. Therefore, high organic matter flux and good preservation conditions both contributed to the formation of the organic-rich shale, and volcanic ash was the dominant source of nutrients for primary productivity.

An improved interference correction for trace element analysis

1992 ◽  
Vol 50 (2) ◽  
pp. 1646-1647
Author(s):  
John J. Donovan ◽  
Donald A. Snyder ◽  
Mark L. Rivers
Keyword(s):  
Trace Element Analysis ◽  
Accurate Estimate ◽  
Simple Expression ◽  
Standard Reference Materials ◽  
Characteristic Line ◽  
Analytical Line ◽  
Element Analysis ◽  
Electron Probe Analysis ◽  
Calculated Concentration ◽  
X Ray

We present a simple expression for the quantitative treatment of interference corrections in x-ray analysis. WDS electron probe analysis of standard reference materials illustrate the success of the technique.For the analytical line of wavelength λ of any element A which lies near or on any characteristic line of another element B, the observed x-ray counts at We use to denote x-ray counts excited by element i in matrix j (u=unknown; s=analytical standard; ŝ=interference standard) at the wavelength of the analytical line of A, λA (Fig. 1). Quantitative analysis of A requires an accurate estimate of These counts can be estimated from the ZAF calculated concentration of B in the unknown C,Bu measured counts at λA in an interference standard of known concentration of B (and containing no A), and ZAF correction parameters for the matrices of both the unknown and the interference standard at It can be shown that:

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