环境水中（类）金属及其化合物检测方案

Hitachi High-Technologies Corporation Certified value of JSAC 0301-3 0.16±0.01 ug/L INTRODUCTION： Chromium is rarely found in natural water. However， as hexavalent chromium is highly toxic， theenvironmental standard for the chromium is specified (NMT0.05 mg/L). By using the twin injectionfunction， newly installed to ZA3000 series instruments， total chromium in river water was analyzed.There are two sample injection ports on the twin cuvette (Pyro D HR) and a large volume can beinjected while the drying time for the analysis can be set at the same as that for a conventional cuvette (Pyro C HR). The data shown below indicates that chromium in river water at a ng/L level can be detected without concentration. INSTRUMENT CONDITIONS MEASUREMENT PARAMETERS GA AUTOSAMPLER Element ： Cr Instrument ： ZA3000 Atomization ： GA Wavelength ： 359.3 nm Lamp Current ： 7.5mA Slit Width ： 1.3 nm Cuvette ： Pyro D HR Meas. Mode ： Working Curve Signal Mode ： BKG Corrected Curve Order ：Linear Calculation ： Peak Height Time Constant：：0.1 sec Temp. Control：： ON Sample Volume ： 60 uL Addition： Speed：4 MATRIX MODIFIER Matrix Modifier ： 100 mg/L Pd+MgVolume： 20 uL Order： After TEMPERATURE PROGRAM NOTE Stage Initial/Final Heating/Keeping Gas Flow Rate Gas Temperature (C) (SeC) (mL/min) 1 Drying 2 Incineration 80/ 140 40/ 0 200 Normal700/700 20/0 200 Normal3 Atomization 2600 /2600 0/3 0 Normal Pyro D HR， a cuvette specially designed for twin injection， was usedfor the measurement. Sample 1： SLRS-4 River Water Reference Material for Trace MetalsSample 2： River water certifiedreference material (without addition) 3 Atomization 2600 /2600 0/3 0 Normal KEY WORDS Atomic Absorption Photometer Environmental Analysis Related， Environmental Water， Clean Water， (AA) Environmental Chemistry， River Water， Chromium， Cr， Flameless， Graphite Furnace， AA， ZA3000， GA， Pyro D HR， Environment Sheet No. AA120020-00