供货周期: | 现货 |
品牌: | 赛默飞 |
规格: | 0.5g |
货号: | USGS25 |
CAS号: |
USGS25 , Ammonium Sulfate
Unit Size: 0.5g
USGS25 is a dried salt of ammonium sulfate [(NH4)2 SO4]) which was prepared in 1992 by J. K. B?hlke, U.S. Geological Survey [1]. The material was prepared from Fisher ammonium sulfate (A938-500, lot #915021) and Cambridge Isotopes ammonium sulfate (99.99% 14N; lot BI 1328) BI 1050) by dissolving and re-crystallizing a mixture of normal reagent salt and 15N depleted salt. The δ15N value of this reference material is the result of the statistical evaluation of interlaboratory comparisons [1,2].
Analyte | Value | Unit | SD | R/I/C |
δ15N | -30.4 | ‰air N2 | 0.4 | C |
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IAEA-N-1 Ammonium Sulfate 0.4g 15N=0.4‰air N2
IAEA-N-2 Ammonium Sulfate 0.4g 15N=20.3‰air N2
IAEA-NO-3 Potassium Nitrate 0.5g 15N=4.7‰air N2 18O=25.6‰VSMOW
USGS32 Potassium Nitrate 0.5g 15N=180‰air N2 18O=25.7‰VSMOW
USGS34 Potassium Nitrate 0.5g 15N=-1.8‰air N2 18O=-27.9‰VSMOW
USGS35 Sodium Nitrate 0.5g 15N=2.7‰air N2 18O=57.5‰VSMOW
USGS25 Ammonium Sulfate 0.5g 15N=-30.4‰air N2
USGS26 Ammonium Sulfate 0.5g 15N=53.7‰air N2
VSMOW Vienna Standard Mean Ocean Water 20ml 2H=0‰ 18O=0 ‰
SLAP2 Water Standard Light Antarctic Precipitation 2 20ml 2H=-427.5‰ 18O=-55.5‰
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