混合饲料中Co元素检测方案(原子吸收光谱)

analytikjenaAGanalytical solutionsAA_SS_19_98_e 12/98 Summary of Analytical Results Determination of Zn and Co in mixed feed with the AAS 5 solid Sample preparation Prior to the analysis， the samples were homogenized by means of a MM2000vibratory mill (Agate mill beaker) for 15 minutes. Method parameters Element 入[nml TPyro[℃] T「Atom[℃] RampAtom[℃/s] Remarks Zn# Co 307.6242.5 5501050 1800 2100 1500 2000 alternative wavelengthalternativewavelength # Purging with argon in atomization step， valve position： MIN (0.1I/min) Element Slit width 「nm] Lamp current [mA] Zn 0.8 6.0 Co 0.2 9.5 Calibration Zinc： Calibration with solid standard (certified reference material BCR 60；aquatic plants； variation of weighed portions) 313 mg/kg zinc Cobalt： Calibration with solid standard (certified reference material IAEA 336；lichens； variation of weighed portions) 0.29 mg/kg cobalt Results Direct Solids GF-AAS Direct Solids GF-AAS Element Sample Mean value [ug/g] RSD [%] Zinc Chicken starter feed Breeding feed 172 ±14 101 ±7 8.3 6.5 Cobalt Chicken starter feed Breeding feed 0.91±0.07 0.63±0.04 7.5 6.5 N= 5 Parallel determinations The solid weighed portions ranged between 178 ug and 364 ug. Red： Analyte signalBlue： Background signal Revised