偏最小二乘分光光度法同时测定砷和磷

在砷、磷钼蓝同时于水相显色的基础上 ,运用偏最小二乘法 (PLS)处理二者重叠吸收峰 ,实现了砷、磷的同时测定。方法的线性范围 :砷 0～ 12 0 μg/5 0mL ,磷 0～ 70 μg/5 0mL ,平均加标回收率 :砷为 95.8%～ 10 3.6% ,磷为 96.2 %～ 10 0 .7% ,相对标准偏差为 4.3 %～ 7.8%。     

钼蓝分光光度法联合测定钢铁中磷砷

基于磷、砷具有相似的化学性质,在一定的酸度条件下,磷、砷都与钼酸铵和铋盐形成磷铋钼杂多酸、砷铋钼杂多酸,在抗坏血酸的作用下还原成磷铋钼蓝和砷铋钼蓝,且其吸光度值具有加合性,测定磷、砷合量的吸光度值后,用亚硫酸钠-硫代硫酸钠-溴化钾复合还原剂还原掩蔽砷,测定磷的吸光度值,从而可以分别测定磷、砷的含量。大多数的金属离子不干扰磷、砷的测定,只有硅在一定的酸度下产生干扰,可以用提高显色酸度的方法来消除,对于高含量硅可以通过分离除去。方法的线性范围为磷:0~0.75μg/mL;砷:0~1.25μg/mL。掩蔽还原砷后磷的显色稳定性较差,加入乳酸得到了改善。本方法用于实验室快速测定钢铁中的磷和砷。     

分光光度法直接测定铁矿中砷

在0.50mol/L的硫酸介质中,砷与钼酸铵、硝酸铋生成铋砷钼蓝络合物。在50mL溶液中,砷的质量在0～100.0μg范围内符合比尔定律,λmax=840 0nm,ε=2.3×104。由此建立了分光光度法测定铁矿中砷的方法。该方法简便、快速,不需用有机试剂作吸收液或萃取,用于含砷铁矿中微量砷的测定,结果令人满意。     

铋磷钼蓝光度法测定磁铁精矿中的磷

在 1.2～ 1.3mol/L的高氯酸酸度下 ,加硝酸铋催化 ,加钼酸铵、抗坏血酸 ,形成磷钼蓝 ,在690nm处 ,磷在 0～ 60 μg/5 0mL符合比尔定律 ,回收率在 97%～ 10 2 %之间 ,本法对测定磁铁精矿中的磷达到了满意的结果     

铋钼蓝光度法联合测定砷和磷的研究

本文较详细地研究了硫酸介质中铋钼蓝光度法联合测定坤和磷的显色条件．制定了五氧化二钒、硅锰合金和锰铁中砷磷联合测定的方法．测得砷铋钼蓝在７３０ｎｍ处有极大吸收；磷铋钼蓝在７００ｎｍ处有极大吸收，。在５０ｍｌ体积内，磷在０～７０ｕｇ．砷在０～１２０ｕｇ范围内符合比尔定律。生产分析实验证明，本法测定磷和砷简便快速，分析结果令人满意。     

钼蓝分光光度法联合测定铁矿石中磷和二氧化硅

以往铁矿石中磷和二氧化硅含量的测定需要分别采用钼蓝分光光度法。在使用磷钼蓝分光光度法时,常会因钒、砷等的干扰使得磷测定结果不准确,需要将样品再处理后才能测定。实验采用石墨垫底铁坩埚,碳酸钠和硼酸混合熔剂高温熔融铁矿石,使铁矿石样品分解彻底,再分别采用铋磷钼蓝和硅钼蓝分光光度法测定磷和二氧化硅含量,从而实现了采用钼蓝分光光度法联合测定铁矿石中磷和二氧化硅。干扰试验表明,在高温熔融时,石墨可将钒(V)还原为钒(III),使样品中钒不干扰磷的测定;显色液中加入15mg硫代硫酸钠溶液可将砷(V)还原为砷(III),继而消除砷对磷测定的干扰。磷的质量浓度在0~3μg/mL范围内遵守比尔定律,校准曲线的线性相关系数为0.9999,表观摩尔吸光系数为2.242×10⁴ L·mol^-1·cm^-1;二氧化硅的质量浓度在0~5μg/mL范围内遵守比尔定律,校准曲线的线性相关系数为0.9995,表观摩尔吸光系数为9.342×10³ L·mol^-1·cm^-1。方法中磷和二氧化硅的检出限分别为0.0026μg/mL和0.0081μg/mL。按照实验方法测定6个铁矿石标准样品中磷和二氧化硅,磷测定结果的相对标准偏差(n=8)小于5%,相对误差小于2%;二氧化硅测定结果的相对标准偏差(n=8)小于2%,相对误差小于1.5%。按照实验方法测定5个铁矿石样品中磷和二氧化硅,磷测定结果的相对标准偏差(RSD,n=8)小于7%,二氧化硅测定结果的相对标准偏差(n=8)小于1%;磷和二氧化硅的测定值均与电感耦合等离子体原子发射光谱法的测定值相一致。     

焙烧矿中磷量的测定——铋盐催化磷钼蓝吸光光度法

本文采用铋盐催化磷钼蓝吸光光度法测定焙烧矿中磷含量,试验结果表明,对于五氧化二磷量10～120μg/50mL的范围内,工作曲线呈线性关系.在690nm处,磷钼蓝络合物的摩尔吸光系数为1.91×104 L.mol-1.cm-1.方法RSD＜5% ,标准加入回收率为98.64～105.58%,结果满意.     

催化褪色光度法测定石煤渣中痕量钼

在Na2 B4 O7-NaOH缓冲溶液中 ,痕量钼 对KBrO3氧化胭脂红的褪色反应有催化作用 ,褪色程度与Mo 量在一定范围内呈线性关系 ,由此建立测定痕量Mo 的分光光度法。结果表明 ,方法的检出限为 1.6× 10 - 1 0 g/mL ,线性范围为0～ 5 0 μg/L。本法已用于测定石煤渣中的微量钼     

钨铁和钨精矿中砷磷的联合测定

钨铁和钨精矿中砷磷的联合测定唐华应（峨眉铁合金（集团）股份有限公司中心化验室，四川峨眉山，６１４２２２）文献分别研究了磷秘钼蓝［１］和砷铋钼蓝［２］光度法的显色条件。但用磷铋钼蓝和砷铋钼蓝光度法实现砷磷联测未见报导。钨铁和钨精矿中砷的定量分析至今仍是...     

三甲氧基苯基荧光酮光度法测定微量钼

研究了三甲氧基苯基荧光酮光度法测定微量钼的方法。在 0.16mol/L磷酸介质中 ,加入适量乳化剂OP ,钼 与显色剂形成 1∶1的橘红色络合物 ,其最大吸收波长在 5 2 5nm处 ,摩尔吸光系数ε =1.3× 10 5,于 2 5mL溶液中 ,钼质量在 0～2 0 μg范围内符合比尔定律。方法具有较高的选择性 ,已用于钢铁中微量钼的测定 ,获得令人满意的效果。     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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China's Aluminum Alloy Cable Market has Taken Shape

正Aluminum alloy cable is a mature product and technology that has been used for nearly fifty years in the U.S.Through six years’promotion,it has been widely recognized and accepted in the China market since 2013,which laid the foundation for the development of the aluminum alloy cable market.Aluminum alloy cable is widely applied in the fields of civil construction and industrial and mining enterprises,especially in real estate,steel and metallurgy.     

Qinghai to Build a 100 Billion Yuan Lithium Industry Base

正At 2014 China Qinghai Trade Fair for Green Development Investment,Qinghai EV Rally2014 was introduced for the first time.With electrical vehicles’eco-friendly features,Qinghai manifested its determination on green development.Introducing Qinghai EV Rally was just a signal.By leveraging its rich salt lake resources