选择性测定钢铁中的钼

研究了用Mo（Ⅵ）－BPR－Tween80－CTMAB体系。该体系的适宜酸度为0．10～0．30mol／LHCI介质中，最大吸收峰位于640nm，摩尔吸光系数ε为2．16×105L·mol-1·cm-1，钼（Ⅵ）量在0～25μg／50mL范围内服从朗伯-比尔定律。研究了各种阴阳离子的干扰情况，实验表明多数金属离子，完全不干扰。此方法已经应用于测定钢铁中的钼，结果十分满意。     

铜（Ⅱ）催化硫脲还原硫氰酸盐光度法测定钼

在硫酸介质中，以Fe2＋和Cu2＋作催化剂，用硫脲还原Mo（Ⅵ）为Mo（Ⅴ），Mo（Ⅴ）与硫氰酸盐生成橙黄色络合物进行测定。有色络合物λmax为470nm，ε＝1．2×104L·mol－1·cm－1，钼量在0－140μg／50mL范围内符合比尔定律。方法用于复杂物料中微量钼的测定，结果满意。     

离子缔合物分光光度法测定钢铁中钼

本文研究了在聚乙醇（WVA）存在下，CU2+催化钼（VI）一硫氰酸盐一孔雀绿（MG）体系水相显色反应，建立了测钼的新的灵敏光度分析法。在硫酸介质中，缔合物的最大吸收在610nm处，表观摩尔吸光系数为3．2×1051.mo1－1.cm-1，钼量在0～10μg／25ml范围内符合比耳定律。用摩尔比法测得Mo：MG＝1：3，推测其可能结构为：[MOO（SCN）5]2-。（MG+）2·（SCN。MG+）。本方法应用于钢铁样品中钼量的测定，结果令人满意。     

Pb(Ⅱ)-BPR-CTMAB-Tween-80-Phen多元络合物显色反应的应用

本文研究Pb(Ⅱ)—BPR—CTMAB—Tween—80—Phen多元络合物显色反应的最佳条件,试验了常见离子的干扰情况,应用该体系光度法测定微量铅。在用M。一BPR—CTMAB体系测定钼时,观察到Pb(Ⅱ)与BPR不起显色反应,当引入过量的CTMAB时,则Pb(Ⅱ)与BPR显色反应立即进行,产生一种蓝色络合物,少量CTMAB存在下,则产生一种蓝色混浊溶液。在过量CTMAB存在下,该体系引入非离子表面活性剂(如TritonX—100、乳化剂OP、Tween—40等),使Pb(Ⅱ)—BPR—CTMAB体系有     

二溴邻硝基苯基荧光酮光度法测定钼

二溴邻硝基苯基荧光酮（ＤＢｏＮＰＦ）曾用于铌、钽和锆的测定〔１～３〕,但用于钼的测定尚未见报道〔４〕。本文研究了该试剂在磷酸介质中与钼的显色反应。利用Ｍｏ（Ⅵ）－ＤＢｏＮＰＦ－ＴｒｉｔｏｎＸ－１００三元体系,建立了测定微量钼的方法。所形成的１：２红色...     

表面活性剂存在下钨─5─溴水杨基荧光酮分光光度法的研究与应用

研究了显色剂５－溴水杨基荧光酮在表面活性剂Ｔｗｅｅｎ－８０和溴化十六烷基三甲铵存在下与钨（Ⅵ）的显色反应。在强酸性介质中,钨（Ⅵ）与５－溴水杨基荧光酮形成１：２的红色络合物,最大吸收波长为５１８ｎｍ,表现摩尔吸光系数为１．３２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,钨含量在０～２５μｇ／２５ｍｌ范围内遵守比尔定律。该体系选择性好,灵敏度高,方法简便,已用于水相直接光度法测定合金钢中的微量钨,结果满意。     

磷钒钼黄光度法快速测定铜合金中磷的方法应用及理论探讨

试样经盐硝混合酸溶解，以过氧化氢将亚磷酸氧化成正磷酸，在酸性介质中，加入钒酸铵和钼酸铵与磷酸形成黄色的磷钒钼三元杂多酸，从而进行磷的测定。磷钒钼三元缔合物形成的适宜酸度为C（H^＋）：0．2～1．6mol／L。酸度过高则显色过慢，甚至抑制显色反应的完成，酸度太低则硅干扰，所以，含硅铜合金试样酸度不应低于C（H^＋）=0.5mol／L。     

用硫氰酸盐光度法准确测定含钼钢中钨含量

本文通过实验详细研究了在2．0－4．5M盐酸介质中，钼（Ⅵ）被氯化亚锡的还原情况以及在硫氰酸盐存在下被氯化亚锡和三氯化钛还原的情况，找到了一种控制色液和参比液中的酸度和氯化亚锡的加入量在一定范围内且两者相等，使钼在显色液和参比液中的吸收（λ：420nm）处相等或极为相近，从而消除钼的干扰的快速，准确测定含钼钢中的钨含量的吸光光度法。     

催化极谱法直接快速测定钢中微量钼

对钼的极谱性能已有较多的研究,提出了好些微量钼的极谱测定体系［１～６］,但未见钼－邻苯二酚紫－溴化十六烷基三甲基铵－氯酸钾的极谱测定体系的报道;经试验,我们发现在这体系中Ｍｏ（Ⅵ）产生良好的二阶导数极谱波,其峰电位为－０．５８Ｖ（ｖｓ．ＳＣＥ）,向体系加入一定量ＥＤＴＡ后,Ｆｅ（Ⅲ）的干扰被消除,不用分离可直接用于钢中微量铝的测定,结果满意。１实验部分１．１主要仪器和试剂ＪＰ－２型示波极谱仪,三电极系统;ｐＨＳ－２型酸度计。邻苯二酚紫：０．０２％溶液;溴化十六烷基三甲基铵：０．０６％溶液;氯酸钾…     

钼－邻硝基苯基荧光酮－CPB显色反应的研究与应用

本文研究了邻硝基苯基荧光酮（ｏ－ＮＰＦ）胶束分光光度法测定钼的显色反应条件。在ＣＰＢ存在下于强酸介质中,Ｍｏ（Ⅵ）与ｏ－ＮＰＦ形成１：２的桔红色配合物,λｍａｘ在５３１ｎｍ处,ε５３１值达１．６３×１０￣５。钼量在０～８．０μｇ／２５ｍｌ范围内符合比尔定律。方法有良好的选择性和稳定性,用于合金钢中钼直接测定,结果满意。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.