石墨炉原子吸收法测定芦笋罐头中砷

采用石墨炉原于吸收法测定芦笋罐头中砷，加入硝酸铵消除氯化钠的干扰，并以镍作为基体改进剂，方法检出限为0，10μkg-1，特征量为0．80pg，回收申为94％一1。5％。     

IONIC CONDUCTIVITY OF METHYLSILOXANE TERMINATED POLYETHYLENE OXIDE WITH LITHIUM PERCHLORATE NETWORK FILMS

Complex films of crosslinked poly(methylsiloxane-co-ethylene oxide) and lithium perchlorate were prepared. These solid state polymeric electrolytes show a markedly higher ionic conductivity, and excellent flexibility. The ionic conductivity of the network films closed to 10~(-5) Scm~(-1) at room temperature. The effects of Li~+ content, species and contents of crosslinking agents, molecular weight of poly(ethylene oxide) and temperature on the ionic conductivity of the network films were also investigated.     

氯嘧磺隆标准品的提纯与表征

以重结晶,柱晶析方法对合成的氯嘧磺隆提纯,并进行了定值分析及定性表征,结果表明,所研制的标准品纯度达99％以上。     

豆磺隆农药标准品的制备研究

豆黄隆 (ｃｈｌｏｒｉｍｕｒｏｎ ｅｔｈｙｌ)化学名 :[2 ( 4 ｃｈｌｏｒｏ 6 ｍｅｔｈｏｘｙｐｙｒｉｍｉｄｉｎ 2 ｙｌｅａｒｂａｍｏｙｌｓｕｌｆａｍｏｙｌ ｂｅｎｚｏａｔｅ) ],2 ( 4 氯 6 甲氧基嘧淀 2 氨基甲酰氨基黄酰基 )苯甲酸乙酯 ;ＣＡＳＮｏ .:90 982 32 4;分子式 :Ｃ1 5Ｈ1 5ＣｌＮ4Ｏ6Ｓ ;相对分子质量 :41 4.8;结构式 :纯品为白色或灰白色固体 ,熔点 1 85～ 1 87℃ ,蒸汽压 0 .49ｎＰａ。该农药由美国杜邦公司开发研制 ,属磺酰脲类 ,系超高效、广谱的大豆田除草剂[1 ] 。九十年代中期在我国开始出现 ,在我国北方大…