title: [Determination of trace germanium in coal by spectrophotometry with 2,4-dichlorophenylfluorone].
abstract: A method for the determination of germanium in coal samples by spectrophotometry has been developed. The color reaction of germanium with 2,4-dichlorophenylfluorone (2,4-DCIPF) in the presence of cetyltrimethylammonium bromide (CTMAB) has been studied. The results show that Ge(IV) reacts on 2,4-DCIPF and CTMAB to form a multicomponent complex in a 1.8-2.5 mol x L(-1) H2SO4 medium. The complex has the maximum absorption wavelength at 516 nm and its apparent molar absorptivity epsilon is 1.38 x 10(5) L x mol(-1) x cm(-1). Beer's law is obeyed in the range of 0-12.5 microg x (25 mL)(-1) for Ge(IV). The recovery of standard addition is 103%-106% and the relative standard deviation (RSD) is 1.1%-1.7%. This method has been applied to the determination of Ge(IV) in coal samples with satisfactory results.
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Sai
authors.forename: Sheng
authors.initials: S
authors.lastname: Li
authors.forename: Fu-bin
authors.initials: FB
authors.lastname: Han
mesh_terms: D015761:4-Aminopyridine / Q000031:analogs & derivatives* / Q000737:chemistry; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D003031:Coal / Q000032:analysis*; D005857:Germanium / Q000032:analysis*; D013053:Spectrophotometry / Q000379:methods*; D014874:Water Pollutants, Chemical
chemical_list: D002593:Cetrimonium Compounds; D003031:Coal; D014874:Water Pollutants, Chemical; D005857:Germanium; C041838:2,4-diamino-5-cyano-6-iodopyridine; D015761:4-Aminopyridine; D000077286:Cetrimonium