By the reaction of 2-amino-, 2-amino-4-methyl-, and 2-amino-4-phenyl-thiazoles, and 2-amino-6-methylbenzothiazole with phenyl,
o-,
m-, and
p-tolyl,
m- and
p-chlorophenyl, and benzoyl isothiocyanate, 1-(phenyl-,
o-,
m-, and
p-tolyl-,
m- and
p-chlorophenyl-, and benzoyl)-3-(2-thiazolyl-, 4-methyl-2-thiazolyl-, 4-phenyl-2-thiazolyl-, and 6-methyl-2-benzothiazolyl) thioureas were prepared. 2-Thioureido-4-methyl- and 2-thioureido-4-phenyl-thiazoles were prepared from the 1-benzoyl compound and 1, 3-bis (4-methyl-2-thiazolyl) thiourea from 2-amino-4-methylthiazole and carbon disulfide, and their reaction of metal ions was examined. These thiazolyl-thiourea derivatives react in hydrochloric acid solution with palladium (II), platinum (IV), and gold (III), in neutral to weak acidity with copper (II), silver (I), and mercury (II), and in ammonia alkalinity with nickel (II), cobalt (II), bismuth (III), cadmium (II), and lead (II). The limit of detection is 0.2γ/cc. for Cu
2+, and Ni
2+, 0.5γ/cc. for Pd
2+ and Ag
+, 1.0γ/cc. for Hg
2+ and Cd
2+, 2.0γ/cc. for Pb
2+ and Au
3+, 5.0γ/cc. for Bi
3+, and 10.0γ/cc. for Pt
4+. Sensitivity of these reagents is higher than that of phenylthiourea derivatives.
Separatory determination of these ions is possible by adjusting the reaction of the solution in using thiazole-thiourea derivatives as the reagent. By adjusting the test solution to hydrochloric acidity, palladium alone can be detected. Addition of potassium cyanide to the test solution and adjusting the solution to alkalinity, platinum alone can be detected, while treatment of the test solution containing cyanide with hydrochloric acid and adjusting the solution to acidity with acetic acid allows detection of copper alone.
Of these reagents tested, the 4-methyl-2-thiazolylthiourea derivative is especially adapted as a reagent for detection of palladium, platinum, and copper.
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