共查询到20条相似文献,搜索用时 109 毫秒
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铁-偶氮氯膦-I-硫脲配合物在0.04 mol/L的Tris-HCl缓冲溶液中(pH9.0±0.1)有一灵敏的吸附波,峰电位在-0.712 V(vs. SCE)左右,该波的二阶导数峰电流I″p与铁浓度在1.0×10-7~1.0×10-9 mol/L范围内呈线性关系(R2= 0.999 1),检出限为5.0×10-10 mol/L(S/N=3)。经多种电化学方法证明,该吸附波为配合物吸附波,其电极过程为不可逆过程,电极反应电子转移数为1。考察了多种离子对峰电流I″p的影响。所拟方法用于水样中微量铁的测定,测定结果的标准偏差为0.22%~2.7%,加标回收率在97.0% ~103.6%之间。 相似文献
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非线性回归分辨重叠极谱吸附波—RE—DBF—偶氮氯膦体系中单一稀土Ce(Ⅲ)T... 总被引:2,自引:0,他引:2
在研究了稀土(Ⅲ)-DBF-偶氮膦配合物极谱吸附波及其分析应用的基础上,针对轻、重稀土与DBF-偶氮氯膦(DBF-CPA)形成的配合物的还原峰峰电位相近,其还原波相互重叠。本文采用化学计量学的非线性回归法,建立两组份(Ce,Tm)的浓度与波高之间的非线性回归模型,并采用正交设计,求出两种稀土混合的峰高对浓度的回归方程,应用求解该回归方程的偏微分方程组的方法,测定了Ce(Ⅲ)、Tm(Ⅲ)混合稀土标准 相似文献
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在pH 4.74的NaAc-HAc缓冲溶液介质中,以氨三乙酸(NTA)作活化剂,MnⅡ可以强烈的催化高碘酸钾氧化三溴偶氮氯膦褪色的反应。通过实验确定了该反应体系的最佳条件,测定了催化动力学参数及催化反应的表观活化能为Ea′=37.73 kJ/mol,表观速率常数为k′=8.85×10-4s-1,探讨了反应机理,确立了反应的速率方程,由此建立了一个测定痕量锰的新方法。本方法的检测限为2.3×10-9g/mL,测定范围为0~10.0 ng/mL。该法具有较好的选择性,用于环境水体试样中痕量锰的测定,加标回收率 相似文献
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In the medium of HCl,Bi(Ⅲ) and Pb(Ⅱ)
with some biarsenazo dyes produced a high sensitive polarographic adsorptive wave of the
isonuclear complex.The detection limit was 1.5×10-9mol/L for Bi(Ⅲ).The
composition of isonuclearcomplexwasdetermined.The reversibility of electrode process,the
character of adsorption and the mechanism of electrode reac-tion were studied.A series of
constants and parameters were calculated.The proposed method has been applied to the
determination of trace bismuth in copper base alloy and hair with satis factory results. 相似文献
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B. G. Naik N. Sivasubramanian 《Mineral Processing and Extractive Metallurgy Review》2013,34(1):243-251
Whereas the beryllium metal is an ideal choice for many applications in nuclear and space technology, its alloys with copper, aluminium, nickel, titanium, oxide and beryllides are equally important and find numerous applications not only in hightech areas, but also in various other fields. This paper presents an appraisal of these uses of beryllium. 相似文献
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研究了镉( Ⅱ) - 碘化钾- 吐温- 20 吸附波的极谱测定条件,加入吐温- 20 可使峰电流提高1 .1 倍,其峰电位为- 0 .72 V(vs . S C E) ,镉( Ⅱ) 浓度在4 ~300 ng/ m L 范围内与峰电流成线性关系,可用于直接测定锌及氧化锌中痕量镉,方法简便、准确,选择性和稳定性好,相对标准偏差≤2 % ,回收率在98 % ~102 % 。 相似文献
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微量钨钼的硫氰酸盐比色法,虽然具有灵敏度高的特点,但由于比色酸度大,微量铁的灵敏颜色干扰,操作不甚方便,为适应地质工作的需要,利用催化波极谱测定,目前已成为最有效的途径。试料经碱熔分解,水浸取,铁、锰、钻、镍等元素呈氢氧化物沉淀与钨、钼分离。分取澄清溶液,在硫酸-苯羟乙酸-氯酸钾-辛可宁底液体系中,钨和钼均能产生灵敏的极谱波。 相似文献
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V. P. SHARMA N. SIVASUBRAMANIAN 《Mineral Processing and Extractive Metallurgy Review》2013,34(1):229-242
Unique combination of physical, mechanical and thermal properties, that beryllium possess makes it an ideal candidate material for space applications, as for examples, in Inertial Guidance Systems, Spacecraft Mechanisms, optics and Structural Element). Its inherent nuclear properties makes it attractive in nuclear programmes. Besides these, it has been a recommended choice in computers, micro electronics, audio industries and medical for high technology systems. Though beryllium is readily machinable for high precision accuracies and excellent surface finishes, yet it has tendency to chip off or edge crack and prone to residual stresses and surface damages. Additionally, inhalable beryllium dust fumes generated during machining is injurious to health. In order to achieve desired accuracies, processing of beryllium calls for appropriate fixturing, adoption of proper cutting parameters, toolings, operation sequencing and proper handling, and job analysis. This paper takes a stock of the present technology and other processes of forming beryllium into shapes. 相似文献
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本文研究了铟—α,α'-联吡啶-硫氰酸铵-氯化四苯胂体系新的络合吸附波。确定了测定铟的适宜底液条件。铟的检测下限为0.0002μg/ml,波高与铟浓度在0.0004~1μg/ml之间呈线性关系。探讨了极谱波的性质。本法已成功地应用于化探样中痕量铟的测定。 相似文献
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概述了我国80年代以来,极谱催化波在硅酸盐岩石分析中的实际应用。引用文献41篇。 相似文献