锌金属中铅元素检测方案(原子吸收光谱)

Hitachi High-Technologies Corporation ZA3000 Sample Pb concentration(ug/L) Recovery rate(%) by only diluting with purified water. Milk contains protein， fat， etc. and the stability of the measured values is affected by foams generated during the sample drying stage. By using the specially designed twin cuvette (Pyro D HR)， a sample is injected into two different injection ports. Therefore， the size of the liquid droplet is reduced to a half compared to the size when injected in only one port while the amount of the sample injected is the same， resulting in the reduced effect by foaming during the drying. As a result， the analysis with a good reproducibility is possible. Milk 1.30 Milk + Pb 5 pg/L 6.35 101 Element ： Pb Instrument ：ZA3000 Atomization ： GA Wavelength ： 283.3 nm Lamp Current ： 7.5 mA Slit Width ： 1.3nm Cuvette ： Pyro D HR Meas. Mode ： Working Curve Signal Mode ： BKG Corrected Curve Order ： Linear Calculation ： Peak Area Time Constantt： 0.1 sec Temp. Control ：ON Sample Volume ：20 uLAddition： Speed：4 MATRIX MODIFIER Matrix Modifier ： 1000 mg/L Pd+MgVolume ： 10 uL Order： After TEMPERATURE PROGRAM NOTE Stage Initial/Final Heating/Keeping Gas Flow Rate Gas Temperature (C) (Sec) (mL/min) 2 Incineration 1 Drying 50/90 60 / 0 20090/300 20/0 200800/800 20/0 3 Atomization 2000/2000 0/3 2000 NormalNormalNormalNormal 4 Cleaning 2800/2800 0/4 200 Normal The specially designed twin injectioncuvette， Pyro D HR， was used for themeasurement. The sample diluted to1/5 with purified water was used for the measurement. CONC (ug/L) Mean ABS SD RSD REF ABS STD 1 0.00 0.0017 0.0006 35.29% 0.20180.025 STD 2 1.00 0.0049 0.0001 2.04% 0.1891 STD 3 3.00 0.0116 0.0004 3.45% 0.1902 3 STD 4 5.00 0.0185 0.0001 0.54% 0.18510.01·一 1 0.26 0.0025 0.0001 4.00% 0.2854 1 0.26×5=1.30 pg/L 0R2： 0.9999 1+ Pb 5ug/L 1.27 0.0059 0.0001 1.69% 0.2822 0.00 1.27×5=6.35 pg/L 0 3 KEY WORDS Atomic Absorption Photometer Bio/Medical Science/Food/Pharmaceutical， Food， Food Chemistry， (AA) Food Component， Milk， Lead， Pb， Flameless， Graphite Furnace， AA， ZA3000， GA， Pyro D HR， Food Sheet No. AA120012-00