| Certified reference materials C ertified reference materials are used as a prerequisite for analytical quality control programs applied in chemical laboratories. Two new CRMs of geological and environmental origin as well as two of biological origin have been prepared. Certification was based on world-wide interlaboratory comparison run followed by evaluation of results with the aid of AQCS-1 program Apatite Concentrate (CTA-AC-1) certified for contents of 25 elements. The "recommended values" for Ba, Ca, Ce, Co, Cu, Eu, Gd, Hf, La, Lu, Mn, Na, Nd, Sc, Si, Sm, Ta, Tb, Th, Ti, U, V, Y, Yb, Zn were established, while for the remaining 11 elements (Al, Dy, Er, Fe, Ho, K, Mg, Ni, Pr, Sr, Zr) the 'information values' were assigned. Fine Fly Ash (CTA-FFA-1) certified for concentration of 40 elements. The 'recommended values' for Al, As, Ba, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, F, Fe, Gd, Hf, La, Li, Lu, Mn, Na, Nd, Ni, P, Pb, Rb, Sb, Sc, Si, Sm, Sr, Ta, Tb, Th, Tm, U, V, W, Y, Yb, Zn were established, while for the remaining 10 elements (Be, Ca, Cd, Ga, In, K, Mg, Mo, Se, Tl) the 'information values' were assigned. Oriental Tobacco Leaves (CTA-OTL-1) certified for concentration of 29 elements. The 'recommended values' for Al, As, Ba, Br, Ca, Cd, Ce, Co, Cr, Cs, Cu, Eu, K, La, Li, Mg, Mn, Ni, P, Pb, Rb, S, Se, Sm, Sr, Tb, Th, V, Zn were established, while for the remaining 11 elements (Au, Cl, Fe, Hf, Hg, Mo, Na, Sb, Sc, U, Yb) the 'information values' were assigned. | |
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