对两种测定甘蔗植株养分消煮仪器的比较分析

Comparison of Two Digestion Instruments for Determining Sugarcane Plant Nutrients

利用凯氏消煮炉(型号:K-424)和远红外消煮炉(型号:LWY848型控温式)两种消煮仪器对甘蔗植株样品进行消煮后,分别测定全氮、全磷、全钾含量,并用多项式曲线拟合比较测定结果。结果表明:远红外消煮制备待测液测定甘蔗植株养分全氮(半微量蒸馏定氮)、全氮(扩散定氮)、全磷、全钾测定值拟合曲线的决定系数(R2)分别:0.719 1、0.758 7、0.329 7、0.656 8;而凯氏消煮的决定系数(R2)分别:0.767 2、0.759 5、0.4758、0.556 0。

There had been digested sample of sugarcane plants with two instruments： K-424 digestion oven（Model： K-424） and far-infrared digestion oven（Model： LWY848） and then the contents of total nitrogen,phosphorus and potassium were measured.The curve fitting results showed that coefficient determination（R 2） of total nitrogen（N in semi-micro distillation）,total nitrogen（N in proliferation）,total phosphorus,total potassium were 0.719 1,0.7587,0.329 7,0.656 8.and 0.767 2,0.759 5,0.475 8,0.556 0,which test liquid had prepared respectively with far-infrared digestion oven and K-424 digestion oven.