Definition | |
Chemical name | 4-(2-benzimidazolyl)thiazole |
2-(4-thiazolyl)-1H-benzimidazole |
Einecs | 205-725-8 |
Chemical formula | C10H7N3S |
Molecular weight | 201,26 |
Assay | Content not less than 98 % on the anhydrous basis |
Description | White, or almost white, odourless powder |
Identification | |
A.Melting range | 296 oC to 303 oC |
B.Spectrometry | Absorption maxima in 0,1 N HCl (0,0005 % w/v) at 302 nm, 258 nm and 243 nm |
at 302 nm ± 2 nm: approximately 1 230 |
at 258 nm ± 2 nm: approximately 200 |
at 243 nm ± 2 nm: approximately 620 |
Ratio of absorption 243 nm/302 nm = 0,47 to 0,53 |
Ratio of absorption 258 nm/302 nm = 0,14 to 0,18 |
Purity | |
Water content | Not more than 0,5 % (Karl Fischer method) |
Sulphated ash | Not more than 0,2 % |
Selenium | Not more than 3 mg/kg |
Arsenic | Not more than 3 mg/kg |
Lead | Not more than 5 mg/kg |
Mercury | Not more than 1 mg/kg |
Heavy metals (as Pb) | Not more than 10 mg/kg |