USGS - science for a changing world

Mineral Resources On-Line Spatial Data

National Geochemical Survey


Home


History


Datasets


Sampling


Status


Methods


Compare


Counties

Download


DB Doc


Refs

As

Au, Pd, Pt

C, S

ICP40

ICP16

ICP10

Hg

NAA

Sb

Se

Te, Tl

W

XRF

NURE

Analysis of Arsenic by Hydride-generation Atomic Absorption Spectrometry (USGS and XRAL laboratories)

Method

100-mg sample aliquots are weighed into zirconium crucibles. Approximately 0.75 g of sodium peroxide is added and mixed. The mixture is heated in a muffle furnace set at 750C for four minutes. The sample is cooled, and 15 ml of water and 5 ml of concentrated HCl are added. The mixture is shaken and 0.25 ml of an ascorbic acid - potassium iodide solution is added, then diluted with 20% HCl and let to stand overnight. Arsenic is then measured using hydride generation atomic absorption spectrometry. Commercially available standards are used to calibrate the instrument. The optimum concentration range without sample dilution in various solid phase sample media is 0.6 ppm to 20 ppm. See Hageman and others (1996, 2002) for further details about this method. Analytical data for an experimental run are deemed acceptable based on results determined for two in-house quality-control standards: recovery for all elements present at >5 times the detection limit must be within 20% of the certified value, and the calculated relative standard deviation of duplicate samples is no greater than 20%.

Data analysis

Distribution maps

Element
QA/QC
Conter-
minous
Alaska
Hawai`i
As (ppm) In progress

(Return to Analytical Methods Page)

U.S. Department of the Interior, U.S. Geological Survey
This page is part of U.S. Geological Survey Open-File Report 2004-1001
URL: http://mrdata.usgs.gov/geochem/doc/arsenic.htm
Maintained by Jeff Grossman
Last modified: 12:07:23 Tue 20 Dec 2016
Privacy statement | General disclaimer | Accessibility