isotope standards, isotopic standards
ISC-Science offers Certified Reference Materials (CRM) that are designed for quantitative analysis by Isotope Dilution Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The stable "non-radioactive" Isotope Standards are certified in concentration and abundances according to ISO 17034.
Isotopic abundance values are reported as percentage [amount fraction (*100), %] and concentration values as micrograms of element per gram of solution (μg/g). According to ISO 17034 and ISO/IEC 17025, the certified concentration value was determined gravimetrically from a standard characterized by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) using a reference method in a single laboratory [Isotope Dilution Mass Spectrometry (IDMS)] and certified isotopic abundances were determined by measuring the isotope-amount ratios for all isotopes by ICP-MS using the enriched isotope stated above as reference. The expanded uncertainty for each certified value was calculated as U = 2 · u, where k = 2 is the coverage factor for a 95% confidence interval and u is the combined standard uncertainty calculated according to ISO Guide 35. The value of u is intended to represent the combined effect of uncertainty components associated with the gravimetric preparation, the IDMS determination, homogeneity and stability for concentration values and the ICP-MS determination for abundance values.
Stability of these materials are based upon rigorous long-term (storage conditions) and short-term (transport conditions) testing of the solution for the certified values according to ISO 17034 and ISO Guide 35. This testing includes, but is not limited to, the effect of temperature.
ISC-Science is a Reference Material Producer accredited by ENAC with accreditation no. 3/PMR004. The marked activities (*) are neither covered by ENAC accreditation no. 3/PMR004 nor its international recognition agreements. ENAC is a signatory to the EA and ILAC Multilateral Agreements for Reference Material Producers.
Check the Technical Annex here.
Certified Reference Materials (CRM) are provided with the following general characteristics:
| Certified concentrations: |
10 - 100 ug/g |
| Certified abundances (equal to or greater than 0.1%): | See product information |
| Minimum isotope enrichment (if not speficied otherwise): | 90% |
| Our Certified Reference Materials can be used in Isotope Dilution Analysis to: | Determine the element concentration in other materials; Precision control; Bias control |
The different marketed standards are shown below. To see the specific characteristics of each product, click on "View product".
6Li-enriched Lithium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 6Li and 7Li.
10B-enriched Boron Isotopic Standard Solution - Certified Reference Material
Certified abundances: 10B and 11B
34S-enriched Sulfur Isotopic Standard Solution - Certified Reference Material
Certified abundances: 32S, 33S, 34S and 36S.
(*) not covered by ENAC accreditation no. 3/PMR004.
50Cr(III)-enriched Chromium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 50Cr, 52Cr, 53Cr and 54Cr.
50Cr(VI)-enriched Chromium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 50Cr, 52Cr, 53Cr and 54Cr.
53Cr(III)-enriched Chromium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 50Cr, 52Cr, 53Cr and 54Cr.
53Cr(VI)-enriched Chromium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 50Cr, 52Cr, 53Cr and 54Cr.
54Fe-enriched Iron Isotopic Standard Solution - Certified Reference Material
Certified abundances: 54Fe, 56Fe, 57Fe and 58Fe
57Fe-enriched Iron Isotopic Standard Solution - Certified Reference Material
Certified abundances: 54Fe, 56Fe, 57Fe and 58Fe
61Ni-enriched Nickel Isotopic Standard Solution - Certified Reference Material
Certified abundances: 58Ni, 60Ni, 61Ni, 62Ni and 64Ni.
65Cu-enriched Copper Isotopic Standard Solution - Certified Reference Material
Certified abundances: 63Cu and 65Cu.
67Zn-enriched Zinc Isotopic Standard Solution - Certified Reference Material
Certified abundances: 64Zn, 66Zn, 67Zn, 68Zn and 70Zn.
70Zn-enriched Zinc Isotopic Standard Solution - Certified Reference Material
Certified abundances: 64Zn, 66Zn, 67Zn, 68Zn and 70Zn.
77Se-enriched Selenium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 74Se, 76Se, 77Se, 78Se, 80Se and 82Se.
86Sr-enriched Strontium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 84Sr, 86Sr, 87Sr and 88Sr.
87Rb-enriched Rubidium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 85Rb and 87Rb.
95Mo-enriched Molybdenum Isotopic Standard Solution - Certified Reference Material
Certified abundances: 92Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo and 100Mo.
109Ag-enriched Silver Isotopic Standard Solution - Certified Reference Material
Certified abundances: 107Ag and 109Ag
111Cd-enriched Cadmium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 106Cd, 108Cd, 110Cd, 111Cd, 112Cd, 113Cd, 114Cd and 116Cd
119Sn-enriched Tin Isotopic Standard Solution - Certified Reference Material
Certified abundances: 112Sn, 114Sn, 115Sn, 116Sn, 117Sn, 118Sn, 119Sn, 120Sn, 122Sn and 124Sn
123Sb-enriched Antimony Isotopic Standard Solution - Certified Reference Material
Certified abundances: 121Sb and 123Sb
137Ba-enriched Barium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba and 138Ba.
142Ce Enriched Standard Solution - Certified Reference Material
Certified abundances: 136Ce, 138Ce, 140Ce y 142Ce.
199Hg-enriched Mercury Isotopic Standard Solution - Certified Reference Material
Certified abundances: 196Hg, 198Hg, 199Hg, 200Hg, 201Hg, 202Hg and 204Hg.
201Hg-enriched Mercury Isotopic Standard Solution - Certified Reference Material
Certified abundances: 196Hg, 198Hg, 199Hg, 200Hg, 201Hg, 202Hg and 204Hg.
203Tl-enriched Thallium Isotopic Standard Solution - Certified Reference Material
Certified abundances: 203Tl and 205Tl
207Pb-enriched Lead Isotopic Standard Solution - Certified Reference Material
Certified abundances: 204Pb, 206Pb, 207Pb and 208Pb
ISC Science is a Reference Material Producer accredited by ENAC.
Accreditation no.: 3/PMR004. Check the Technical Annex here.
Savillex products and services different than Reference Material Production are not covered by ENAC accreditation no. 3/PMR004.
