title: [The determination of chromium in feeds by flame atomic absorption spectrophotometry].
abstract: Chromium in feeds is regulated by China Standard GB 13078-2001. A method of flame atomic absorption spectrophotometry for the determination of Cr in feeds has been developed in allusion to shortage of China standard method. Several acetylene flow-rate, burner-high and the additive of interference suppressor NH4Cl were studied respectively on the effect of sensitivities of Cr(III) and Cr(VI). The two sets analytical average results of Cr in feed sample determined by calibration curves of Cr(III) and Cr(VI) were tested by t test, no marked discrepancy was found. Optimum instrumental conditions of Cr(III) and Cr(VI) with same sensitivity were confirmed. Sensitivity was 0.014 microg x mL(-1) with detection limit 0.70 mg x kg(-1). The recoveries were 94.4%-104.9%. Relative standard deviation of sample determination (5-6 times) was 1.90%-4.08%. This method is simply, fast and exact, the detection limit was answered for Cr limit in feeds regulated by GB 13078-2001, it can be applied to the analysis of Cr in feeds.
authors.affiliation: The Supervision and Test Centre of Agricultural Product Quality, Ministry of Agriculture, Zhengzhou 450002, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Jia
authors.forename: Li-ping
authors.initials: LP
authors.lastname: Guo
authors.forename: Qiu-ping
authors.initials: QP
authors.lastname: Lin
mesh_terms: D000114:Acetylene / Q000737:chemistry; D000643:Ammonium Chloride / Q000737:chemistry; D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D002138:Calibration; D002645:Chickens; D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013552:Swine; D013696:Temperature
chemical_list: D000643:Ammonium Chloride; D002857:Chromium; D000114:Acetylene