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6906399 
Journal Article 
Determination of heavy metals in toothpastes containing tin as an active ingredient 
Rao, RN; Rao, TN; , 
2014 
Yes 
Indian Journal of Chemical Technology
ISSN: 0971-457X 
NATL INST SCIENCE COMMUNICATION-NISCAIR 
NEW DELHI 
21 
4 
238-243 
WOS:000348007400002 
This study discusses the technical rationale behind the development and validation of an alternative AAS and colorimetric methods for the determination of heavy metals in toothpastes containing tin as an active ingredient. Using BLS 6356:2001 method, it is found to be difficult to analyze toothpastes containing <100 ppm Pb, based on the PbS color formed by addition of sodium sulfide. In the present investigation an alternative, highly sensitive and specific AAS method has been developed and validated. The minimum detection limits are found to be 0.222 mu g/mL, 0.010 mu g/mL, 1.873 ng/mL, 5.465 ng/mL, 2.949 mu g/mL for Pb, Cd, Hg, As and Sn respectively. 
Atomic absorption spectrophotometric method; Colorimetry; Heavy metals; Toothpastes