8 Hour Stability
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Table 8 shows the results for a duplicate analysis test<br />
with the LCS sample. Agreement between duplicates is<br />
generally within 1%, well within the EPA limit of 20%.<br />
ELEMENT ANALYSIS 1 ANALYSIS 2 % DIFFERENCE<br />
As 23.1µg/g 23.3µg/g 0.8<br />
Ba 407µg/g 403µg/g 1.0<br />
Ca 2.55% 2.54% 0.4<br />
Cd 3.50µg/g 3.46µg/g 1.1<br />
Co 14.3µg/g 14.4µg/g 0.7<br />
Cr 132µg/g 131µg/g 0.8<br />
Cu 100.2µg/g 101µg/g 0.8<br />
Fe 4.03% 4.04% 0.3<br />
K 2.02% 2.03% 0.6<br />
Mg 1.21% 1.20% 0.3<br />
Mn 547µg/g 543µg/g 0.8<br />
Na 0.53% 0.54% 1.8<br />
Ni 43.8µg/g 44.1µg/g 0.7<br />
Pb 163µg/g 163µg/g 0.2<br />
Sb 3.61µg/g 3.65µg/g 1.1<br />
Ti 0.46% 0.46% 0.4<br />
V 93.0µg/g 92.3µg/g 0.8<br />
Zn 440µg/g 435µg/g 1.1<br />
Table 8. NBS 2704 Buffalo River Sediment Duplicate Analysis Test<br />
Table 9 shows the recoveries from spiked samples of<br />
the LCS, again all well within the EPA 25% limit.<br />
ELEMENT CERTIFIED VALUE SPIKE CONC MEASURED VALUE % REC<br />
www.thermo.com/elemental<br />
µg/L µg/L µg/L<br />
As 230 50 276 92<br />
Ba 4140 100 4234 94<br />
Cd 34.5 10 43.6 91<br />
Co 140 10 151 110<br />
Cr 1350 50 1402 104<br />
Cu 986 50 1033 94<br />
Mn 5550 100 5652 102<br />
Ni 441 10 450 90<br />
Pb 1610 50 1656 92<br />
Sb 37.9 10 47.0 91<br />
V 950 50 1004 108<br />
Zn 4380 100 4482 102<br />
Table 9. NBS 2704 Buffalo River Sediment Spike Sample Recovery Data<br />
In order to check that the method works for different<br />
sample matrices, a reference sample of a sewage sludge<br />
(BCR146) was analysed using exactly the same procedure.<br />
Table 10 compares the measured and certified results for<br />
the sediment sample, demonstrating the excellent<br />
agreement. Values in brackets are advisory figures only.<br />
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ELEMENT MEASURED CONCENTRATION CERTIFIED VALUE<br />
Ca 10.2% (10.14%)<br />
Cd 75.8µg/g 77.7 +/- 2.6<br />
Co 11.9µg/g 11.8 +/- 0.7<br />
Cu 928µg/g 934 +/- 24<br />
Fe 1.80% (1.86%)<br />
K 0.49% (0.48%)<br />
Mg 2.01% (1.99%)<br />
Mn 570µg/g 588 +/- 24<br />
Na 0.21% (0.22%)<br />
Ni 276µg/g 280 +/- 18<br />
P 2.52% (2.58%)<br />
Pb 1260µg/g 1270 +/- 28<br />
Zn 4040µg/g 4059 +/- 90<br />
Table 10. BCR146 Sewage Sludge Data<br />
5. Conclusions<br />
The IRIS Intrepid II demonstrates SW-846 Method 6010B<br />
compliant analysis for a range of sample types and easily<br />
copes with the stringent interference checks and AQC<br />
requirements stipulated for use in this method.<br />
The IRIS Intrepid II is the latest generation of IRIS<br />
ICP Spectrometers from Thermo Electron. It incorporates<br />
a new design of the exclusive charge injection device<br />
(CID) detector housed in a highly regulated optical<br />
system. The result of these product developments is an<br />
instrument that is capable of providing extremely low<br />
detection limits and excellent long term stability. This<br />
makes the IRIS Intrepid II ideally suited for cost-effective<br />
elemental analysis in the environmental field.<br />
References<br />
USEPA SW-846 Method 3050B, Revision 2, December 1996.<br />
USEPA SW-846 Method 3051A, Revision 1, January 1998.<br />
USEPA SW-846 Method 6010B, Revision 2, December 1996.<br />
USEPA SW-846 Method 6010C, Revision 3, November 2000.<br />
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AN_E0637 06/03
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