University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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USGS AGV-1

Classification: Reference Material -> USGS -> AGV-1 -> Andesite

Citations 2

"Analysis Of Samples Containing Large Amounts Of Dissolved Solids Using Micro-sampling Flow Injection Inductively Coupled Plasma Mass Spectrometry"
J. Anal. At. Spectrom. 1992 Volume 7, Issue 8 Pages 1201-1205
Andreas Stroh, Uwe Völlkopf and Eric R. Denoyer

Abstract: The use of micro-sampling flow injection ICP-MS was investigated for the analysis of samples containing large amounts of dissolved solids such as brines. The flow injection parameters, e.g., sample delivery rate and sample loop volume were optimized (at 1.5 mL min-1 and 500 µL, respectively) with respect to signal peak height and stability. Short- (5 min) and long- (>2 h) term precision were investigated; corresponding coefficient of variation were 0.4 to 5.1% and 5%. Detection limits in a 3% NaCl matrix were 0.002 to 2.778 µg L-1 which were 2 to 5 times better than those obtained using continuous-flow sample aspiration of the same matrix. The method was applied to the analysis of standard rock reference material AGV-1 after lithium tetraborate fusion. Recoveries were 83 to 119%. The use of microsampling flow injection inductively coupled plasma mass spectrometry for the multi-elemental analysis of samples containing large amounts of total dissolved solids is described. The flow injection parameters such as sample delivery rate and sample loop volume were optimized with respect to signal peak height and stability. Short- (5 min) and long- (>2 h) term precision of the technique were investigated and detection limits in a 3% (mass/v) NaCl matrix were determined The detection limits for flow injection were 2-5 times better than those for continuous-flow sample aspiration of the same matrix. Standard reference rock material AGV-1 from the United States Geological Survey was analyzed after lithium tetraborate fusion (>1.2%(m/v) salt) to demonstrate the accuracy of the proposed method. Recovery experiments were carried out using spiked (10 µg L-1) 1 and 3%(m/v) NaCl solutions and were found to be acceptable for such matrixes ranging from 83 to 119%.
Sample preparation Mass spectrometry Dissolved solids Reference material Optimization

"Spectrophotometric Determination Of Silicon In Silicate Rocks By Flow Injection Analysis"
Anal. Sci. 1988 Volume 4, Issue 5 Pages 523-525
T. UCHIDA, K. YAMAMOTO, H. INOUE, I. KOJIMA, and C. IIDA

Abstract: A system is described and illustrated for flow injection spectrophotometric determination of Si. Powdered silicate rock (25 mg) is decomposed with 0.5 mL of HCl and 0.25 mL of HF by repeated (x3) heating and cooling for 1 and 5 min, respectively. After cooling and addition of 5 mL of 4% H3BO3 solution, the mixture is diluted with water. A 65 µL portion is injected into the carrier stream (0.6 M HCl, 2.45 mL min-1), which is then mixed with 3% (NH4)6Mo7O24 solution (2.45 mL min-1). The mixed solution then passes to a 200-cm reaction coil maintained at 45°C, and the absorbance is measured at 415 nm in a flow-through cell. The method is suitable for determination of 200 to 380 µg g-1 of Si. Results for determination of Si in 22 standard rock samples agreed with certified values. The coefficient of variation (n = 5) was 0.4%.
Silicon Sample preparation Spectrophotometry Heated reaction Reference material