Cacotheline as a reagent for the detection of ferrous and ferric iron

✍ Scribed by G. Gopala Rao; V. Narayana Rao; G. Somidevamma; K. Lalita

• Publisher: Elsevier Science
• Year: 1955
• Tongue: English
• Weight: 712 KB
• Volume: 12
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)87837-x

✦ Synopsis

Unzverszly, Waltaar (India)

Cacotheline is a yellow powder obtained by the nitration of brucinc. LEUCIIS AND L~uc~rs~ appear to have been the first to notice that stannous salts 1Jroducc a characteristic amethyst colour with cacothclinc. LI~UCIIS, OSTEI~BUII~~SU K:~EIIIW~ and I,EUC~IS, WIX;KI.EI< ASIJ LEUCIIS~ reported that reducing anions such as sulphide, sulphite, hisulphitc and thiosulphate also reduce cacothclinc to a rcdcolourcd compound unclcr suitable conditions. C;vrzerTq proposed this colour reaction as a sensitive test for stannous tin. ~;EXCL~ stated that the test is more sensitive when carried out as a spot test rather than in a test tube. He gave the limit of identification as 0.2 y tin and the concentration limit as I :250,000.

NEWELL

and co-workers0 carried out a somewhat detailed investigation on the sensitivity of this test and the interfcrenccOof various ions in carrying out the test for stannous tin. They found that Sb+3 salts also give the test but only at concentrations higher than 10'~ molar. RD~ENTIIALER~ stated that a colour similar to that given by Sn+2 is also given by Ti'", U+es, Rhek3, the lower oxides RAO Ct cd. VOL.