Spot test detection of sulfide in minerals

✍ Scribed by Frank L. Chan

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 258 KB
• Volume: 37
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(01)80689-9

✦ Synopsis

The study described below was designed to give comparative data on some old and new tests for the detection of sulfides in minerals, in order to find out if there are any differences in the behavior of different sulfide minerals. The following tests were examined.

Methods (I) Iodine-a&de test.

This test is based on the catalytic action by sulfide on the reduction of iodine by sodium azidei.

(II) Benzokt fusion test. Molten benzoin (m.p. 137') reacts specifically with elemental sulfur to give hydrogen sulfider.

(III)

Pyrolytic formation of (CN)&3 and (CNS)s. Method A.

Small amounts of the sample were mised with escess of mercury(I1) cyanide and heated to x30--180~ in a glycerine bath in micro test tubes. For the detection of (CN)& the tubes were covered with a piece of Congo-red paper moistened with 5% hydrogen peroxide. A black spot shows the presence of (CN)&.