水环境磷的灰化法测定中不同灰化助剂的效果比较  

A Comparison of Efficiency of Different Auxiliaries Used in Phosphorus Determination by Ignition Method

作　　者：周毅[1] 张福绥[1] 杨红生[1] 马锡年[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《环境科学》2002年第4期107-112,共6页Environmental Science

基　　金：国家自然科学基金项目 (30 10 0 139;30 170 74 2 );国家重点基础研究规划项目 (G19990 12 0 12 );中国科学际知识创新工程项目 (KZCX 4 0 3;2 11)

摘　　要：以磷酸二氢钠和偏磷酸钠为磷标样 ,对加入不同盐试剂 (灰化助剂 )经不同温度 (1 5 0℃～ 5 5 0℃ )灼烧后磷的回收率进行了比较 .所研究的灰化助剂除文献中报道过的MgSO4 和Mg(NO3) 2 外 ,还对MgCl2 等 1 0余种盐试剂进行了实验 .结果发现 ,磷酸二氢钠和偏磷酸钠加入MgSO4 在常规的灼烧温度下灼烧 ,用 0 2mol/LHCl于 80℃浸提 0 5h不能使磷全部回收 ,而MgCl2 、MgAc2 、Mg(NO3) 2 、CaCl2 等助剂 ,却都能使灼烧后的磷易于且完全回收 .本研究认为 ,在利用目前已被广泛应用的由Sol幃ｒｚａｎｏ和Ｓｈａｒｐ提出的ＭｇＳＯ4 高温灰化法分析水体中的颗粒磷和总磷或有机体中的磷时 ,应当用MgCl2 (或MgAc2 )取代MgSO4 作为灰化助剂 .尽管Mg(NO3) 2 也是高效的灰化辅助剂 。Researches on phosphorus recoveries from NaH 2PO 4 and (NaPO 3) n (n ≥2) after ignition at temperature from 150℃ to 550℃ with auxiliary, such as MgSO 4, Mg(NO 3) 2, MgCl 2, MgAc 2, CaCl 2 and so on, were finished. It was found that the phosphorus can not be completely recovered when NaH 2PO 4 or (NaPO 3) n (n ≥2) was ignited together with MgSO 4 at routine ashing temperature (500℃) with the final mixture extracted with 0 2 mol/L HCl at 80℃ for 0 5h. In contrast, MgCl 2,MgAc 2, Mg(NO 3) 2 and CaCl 2 can all make the phosphorus recoveries completely. MgCl 2 (or MgAc 2) rather than MgSO 4 in the research was suggested. To be utilized as ashing auxiliary in the phosphorus determination with ignition method. Although Mg(NO 3) 2 is a highly effective auxiliary, yet danger of explosion, toxicity of nitrogen dioxide and more manipulation steps may impede its widespread utilization.

关 键 词：水环境 磷 灰化法 测定 灰化助剂 效果比较 水质监测 

分 类 号：X832[环境科学与工程—环境工程]