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
Website: @unf

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NIST 1645

Classification: Reference Material -> NIST -> 1645 -> River sediment

Citations 3

"A Flow Injection/hydride Generation System For The Determination Of Arsenic By Inductively-coupled Plasma Atomic Emission Spectrometry"
Anal. Chim. Acta 1984 Volume 161, Issue 1 Pages 275-283
R. R. Liversage and J. C. Van Loon, J. C. De Andrade

Abstract: After optimizing the concentration. of HCl and NaI in the test solution, the concentration. of NaBH4, sample and reductant volume and flow rate, Ar carrier-gas flow rate and r.f. power, As (10 to 1000 ppb) was determined in NBS orchard leaves, coal fly ash and river sediment and NRCC MESS-1 and BCSS-1 standard reference materials with good accuracy and precision by using an ARL 34000 Quantometer. The coefficient of variation (n = 10) at the 100-ppb level of As was 7.2%, and the detection limit was 1.4 ng for a 0.17 mL sample volume The calibration graph was rectilinear for 0.01 to 1 ppm of As. Cobalt, Ni, Ag, Au, Bi, Te and Sn interfered. About 200 injections h-1 were possible.
Arsenic Spectrophotometry Interferences Reference material

"Hydride-generation Flow Injection Using Graphite Furnace Detection - Emphasis On Determination Of Tin"
Spectrochim. Acta B 1992 Volume 47, Issue 5 Pages 701-709
Zhang Li, Susan McIntosh, Glen R. Carnrick and Walter Slavin*

Abstract: Hydride-forming analytes were separated from large volume of matrix by trapping the hydrides on a Pd-coated L'vov platform at low temperature before analysis by AAS. The Pd-treated stabilized-temp. platform furnace was used for in situ trapping and atomization of the analyte, and was at least 80% efficient for As, Bi, Ge, Sb, Se, Sn and Te. The method was tested by determining Sn in steel, river sediment, orchard leaves and bovine liver standard reference materials. The detection limit for Sn was 7 ng l-1, and the coefficient of variation was 31.5% at the 1.0 ng level. Other hydride-forming elements did not interfere.
Arsenic Bismuth Germanium Antimony Selenium Tellurium Tin Spectrophotometry Interferences Volatile generation Reference material Volatile generation

"Comparison Of Acid Mixtures In High-pressure Microwave Digestion Methods For The Determination Of The Total Mercury In Sediments By Cold Vapor Atomic Absorption Spectrometry"
Anal. Sci. 1996 Volume 12, Issue 3 Pages 471-476
C. Y. ZHOU, M. K. WONG, L. L. KOH and Y. C. WEE

Abstract: Four acid mixtures, viz. HNO3/H2SO4, HNO3/HClO4, HNO3/HCl and HNO3/HCl/HF, were evaluated as solvents for the high-pressure microwave digestion of environmental sediments for analysis of total Hg by cold vapor AAS. Sediments were dried at 105°C for 4 h and a 300 mg portion of each was digested with 14 mL of each acid mixture (acid ratios given) in an MDS-2000 Microwave System (CEM Corp., Mathews, NC, USA) operated at 630 W power, 150 psi pressure and 200°C for 30 min. After digestion, the samples were cooled until the pressure in the vessels was reduced to 50 psi, filtered and the filtrate was diluted to 50 mL with water. A 10 mL portion of the diluted filtrate was mixed with 0.2 mL 5% KMnO4 solution and a 500 µL portion of the mixture was injected into a Perkin-Elmer FIA System interfaced with a Perkin-Elmer 4100ZL atomic absorption spectrometer (instrumental details given) for measurement of Hg absorbance at 253.6 nm. Best results were obtained with the HCl/HNO3/HF mixed acid solvent. The method was successfully applied to the analysis of three sediment reference materials, viz. NIST SRM 1645 River Sediment, NIES CRM No. 2 Pond Sediment and NRCC BCSS-1 Marine Sediment with recoveries of 92-108%.
Mercury Sample preparation Spectrophotometry Reference material Optimization