Each v-21+k wear metals standard 30 µg/g, hydrocarbon oil, 200 g includes the following elements: ag, al, ba, b, cd, ca, cr, cu, fe, k, mg, mn, mo, na, ni, p, pb, si, sn, ti, v, zn concentration: 30 µg/g, matrix: hydrocarbon oil and volume: 200 g. o 1 * 1 items