German standard methods for the examination of water, waste water and sludge; cations (group E); determination of Ag, Al, As, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, S, Sb, Se, Si, Sn, Sr, Ti, V, W, Zn and Zr by inductively coupled plasma atomic emission spectrometry (E 22)
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