【摘要】 粮食和饲料等植物的干样经湿法或干法溶样处理,样品溶液经100倍以上稀释,直接进样于热解涂层石墨管中进行钻的测定。本法无须预分离富集,也不需要加入其它基体改进剂,与文献报道的方法相比操作简便、灵敏度较高、避免了加入其它试剂带来的沾污。测定的相对标准偏差为3.8％,检测限1.5×10^-12g。含钴量为10ppb以上的干样可被测定,回收率为87～107％。对国家标准物桃叶进行测定其结果一致。更多还原

【Abstract】 Dry samples are ashed or digested with acids, and diluted by 100 factors with 0.OIN HNO₃, then directly measured by graphite furnace AAS without preconcentration, preseparation and addition of matrix modification agents. This procedure is simpler, more sensitive and has less contamination from reagents than others using GFAAS. More than 10 ppb Co in dry samples can be quantitatively determined. 21 elements of plant in common concentration do not interfere with the accuracy, The linear standard curve is obtained between 10^-（11） and 10-（10）g. The method gives recoveries of 87-107%, detection limit of 1.5×10^-（12）g and relative standard deviation of 3.8%. The cobalt content of national standard substance peach leaves measured by this method is in good agreement with that recommended.更多还原