The reaction between Mo(VI) and DDTC was
reported to take place over the pH range of 2–9
[14]. This statement is questionable, as our experiments
showed that it, like Sn(IV), reacts with
either DDTC or TDTC at pH56 only. Hence,
Mo(VI) would accompany Sn(IV) in the filtrate
after the preliminary separation at pH 9. This
interference from Mo can not be eliminated by
masking with EDTA or hydroxylamine (which
was used to mask the precipitation of MoS3 in
acid solution) [19] alone, nor as Mo(VI)–
NH2OH–EDTA