addition of iron as ferrous sulfate to form ratios of sn/fe/zn of 1:1:1 and 2:2:1 with the standard zinc solution and the appropriate doses of tin produced a reduction of zinc absorption not dissimilar from that seen previously with zinc and iron alone , and addition of picolinic acid did not influence the uptake of zinc from the solution with the 2:2:1 sn/fe/zn ratio .
C0060282
ferrous sulfate
C0302583
iron