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西洋参鲜细胞中微量元素的ICP—AES方法的测定 总被引:1,自引:0,他引:1
本文应用ICP-AES法同时测定西洋参鲜细胞中14种微量元素。用硝酸-高氯酸混合消解样品。选用了仪器最佳折衷条件,并采用了干扰等效浓度消除光谱干扰。本法的准确度及密度均达到满意结果,方法简便,快速。 相似文献
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ICP—AES法同时测定岩石,矿物,土壤等样品中十五种稀土元素的方法研究 总被引:3,自引:0,他引:3
本文应用强酸I号离子交换树脂将稀土元素与基体元素分离,待测液直接用ICP-AES同时测定15种稀土元素,测定中采用干扰等效浓度法,消除稀土元素之间和残余基体元素产生的光谱干扰,方法具有较高的准确度和精密度,是目前较理想的测定岩石等样品中微量稀土元素的方法。 相似文献
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火焰原子吸收法间接测定1,3-苯二甲酸二甲酯-5-磺酸钠中的硫酸根 总被引:1,自引:0,他引:1
1引言目前,微量硫酸根的测定已显得愈加重要。化纤级1,3-苯二甲酸二甲酯-5-磺酸钠(三单体)主要用于生产阳离子染料可染的改性涤纶聚酯,是目前使用最多的改性染色剂,出口需求较大。国外要求三单体中的含量优等品应低于0.03%。目前采用沉淀比色法测定,但受到检测限的限制,只能测出大致范围,给三单体的等级判定带来困难。本文采用在中性介质中,硫酸根、铜与新试铜灵定量结合成[Cu(neocuproine)2,在极性条件下,这种缔合物能被萃取进甲基异丁基甲酮,萃取率高达98%,用火焰原子吸收法测定有机相中铜离子的量,从而间接测定硫酸… 相似文献
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In this paper the following results are got 1. We prove that the order definitionwhich is given by J.F. Trawb on the iterative function is wrong. 2. A existent theorem on the repulsive point is given. 3. We give some theorems to judge a fixed point of iterative function. They all imporve the Ostrowski's theorems. 相似文献
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Binding equilibrium study between Mn( Ⅱ ) and HSA or BSA 总被引:2,自引:0,他引:2
The binding of Mn( Ⅱ ) to human serum albumin (HSA) or bovine serum albumin (BSA) has been studied by equilibrium dialysis at physiological pH (7. 43). The Scatchard analysis indicates that there are 1.8 and 1.9 strong binding sites of Mn( Ⅱ ) in HSA and BSA, respectively. The successive stability constants which are reported for the first time are obtained by non-linear least-squares methods fitting Bjerrum formula. For both Mn( Ⅱ )-HSA and Mn( Ⅱ )-BSA systems, the order of magnitude of K1 was found to be 104. The analyses of Hill plots and free energy coupling show that the positive cooperative effect was found in both Mn( Ⅱ )-HSA and Mn( Ⅱ )-BSA systems . The results of Mn ( Ⅱ ) competing with Cu ( Ⅱ ) 、 Zn(Ⅱ)、Cd( Ⅱ) or Ca( Ⅱ ) to bind to HSA or BSA further support the conjecture that there are two strong binding sites of Mn( Ⅱ) in both HSA and BSA. One is most probably located at the tripeptide segment of N- terminal sequence of HSA and BSA molecules involving four groups composed of n 相似文献