分析仪器
分析儀器
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ANALYTICAL INSTRUMENTATION
2014年
6期
33-35
,共3页
分光光度法%钼的测定%硫脲还原法
分光光度法%鉬的測定%硫脲還原法
분광광도법%목적측정%류뇨환원법
spectrophotometry%determination of molybdenum%thiourea reduction
M o5+与硫氰化物作用,生成红色的络合物,颜色深浅与M o5+含量呈线性正相关,借此进行钼的比色测定。Cu2+和Fe3+同时存在,对钼的硫氰化物生成有催化作用。此时,Cu2+与硫脲生成无色络合物,Fe3+在Cu2+的催化下,被硫脲还原为Fe2+,Fe3+和Cu2+对钼的红色络合物无干扰。方法用于矿石和冶金废渣样品分析,测定值的相对标准偏差(n=6)在0.19%~8.6%之间,回收率在95%~105%之间。实验结果表明该方法具有灵敏度高、定性和定量准确等特点,解决了 Fe3+和 Cu2+在分析比色时干扰问题。此方法的原理为2M oO42-+2CS (NH2)2+10CNS-+10H+=2[MoO(CNS)5]2 -+2CS(N2 H3)+6H2 O
M o5+與硫氰化物作用,生成紅色的絡閤物,顏色深淺與M o5+含量呈線性正相關,藉此進行鉬的比色測定。Cu2+和Fe3+同時存在,對鉬的硫氰化物生成有催化作用。此時,Cu2+與硫脲生成無色絡閤物,Fe3+在Cu2+的催化下,被硫脲還原為Fe2+,Fe3+和Cu2+對鉬的紅色絡閤物無榦擾。方法用于礦石和冶金廢渣樣品分析,測定值的相對標準偏差(n=6)在0.19%~8.6%之間,迴收率在95%~105%之間。實驗結果錶明該方法具有靈敏度高、定性和定量準確等特點,解決瞭 Fe3+和 Cu2+在分析比色時榦擾問題。此方法的原理為2M oO42-+2CS (NH2)2+10CNS-+10H+=2[MoO(CNS)5]2 -+2CS(N2 H3)+6H2 O
M o5+여류청화물작용,생성홍색적락합물,안색심천여M o5+함량정선성정상관,차차진행목적비색측정。Cu2+화Fe3+동시존재,대목적류청화물생성유최화작용。차시,Cu2+여류뇨생성무색락합물,Fe3+재Cu2+적최화하,피류뇨환원위Fe2+,Fe3+화Cu2+대목적홍색락합물무간우。방법용우광석화야금폐사양품분석,측정치적상대표준편차(n=6)재0.19%~8.6%지간,회수솔재95%~105%지간。실험결과표명해방법구유령민도고、정성화정량준학등특점,해결료 Fe3+화 Cu2+재분석비색시간우문제。차방법적원리위2M oO42-+2CS (NH2)2+10CNS-+10H+=2[MoO(CNS)5]2 -+2CS(N2 H3)+6H2 O
The color depth of a red complex which is formed by Mo5 + and thiocyanate is linear positive correlation with content of Mo5 + ,so that we can get the colorimetric determination of molybdenum .Cu2 + and Fe3 + which exist at the same time catalyze the generation of thiocyanate on Mo .At this time ,Cu2 + and thiourea generates colorless complex ,Fe3 + under the catalysis of Cu2 + is reduced to Fe2 + by thiourea under the catalysis of Cu2 + .There is no interference when Fe3 + in the Cu2 + red complex of molybdenum .This method is used to the analysis of mineral and metallurgical slag samples ,and the determination of worth relative standard deviation (n = 6) are between 0.19% ‐8.6% ,the recovery rate is 95% ‐105% .Experimental results show that this method has high sensitivity ,accurate qualitative and quantitative characteristics . This method solves the problem of interference when the solution of Fe3 + and Cu2 + is experimented with analysis colorimetry .The principle of this method is 2MoO42 - + 2CS(NH2 )2 + 10CNS- + 10H+ = 2 [MoO (CNS)5 ]2 - + 2CS(N2 H3 ) + 6H2 O .