Gravimetric determination of tin with sodium cyclotetramethylenedithiocarbamate and its applications in metal analysis.
A gravimetric determination of tin is proposed with sodium cyclotetramethylenedithiocarbamate as precipitant at pH 5.0-5.5. By optimizing the reaction conditions the theoretical conversion factor 0.1687 can be used for determining >/=5% of Sn. Its standard deviation (n=10) at the level of 20 mg of Sn was found to be 0.08 mg. Effects of diverse cationic species can be eliminated by a clear-cut group precipitation at pH 9 with DDTC in the presence of tartrate and subsequent masking with EDTA. Provision is also made for removal of individual species in occasional cases. Hence, the proposed method is flexible and versatile and was successfully applied to the macro-determination of Sn in diverse alloys.
Nan
Z
Z
Shanghai Research Institute of Materials, 99 Handan Lu, Shanghai 200437, People's Republic of China.