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ANALYTICAL INSTRUMENTATION
2015年
3期
15-18
,共4页
紫外-可见分光光度法%Na2 S2 O8%萘酚绿B%高铼酸铵
紫外-可見分光光度法%Na2 S2 O8%萘酚綠B%高錸痠銨
자외-가견분광광도법%Na2 S2 O8%내분록B%고래산안
Uv-vis spectrophotometer%sodium persulfate%Naphthol green B%ammonium perrhenate
基于铼抑制Na2 S2 O8氧化萘酚绿B的褪色反应，结合紫外‐可见分光光度法，建立了测定铼的新方法。确定了抑制体系的动力学条件，并计算了抑制反应的表观活化能Ea＝84.65 KJ／mol ，反应速率常数K ＝1.95×10－4／s。在最佳实验条件下，铼的浓度在0.2～16.00 mg／L范围内与相对吸光度呈良好的线性关系，检出限为6.0μg／L。用于钼矿焙烧烟尘中铼含量的测定，相对标准偏差为2.1％～2.9％，标准加入回收率为95.0％～104％，结果令人满意。
基于錸抑製Na2 S2 O8氧化萘酚綠B的褪色反應，結閤紫外‐可見分光光度法，建立瞭測定錸的新方法。確定瞭抑製體繫的動力學條件，併計算瞭抑製反應的錶觀活化能Ea＝84.65 KJ／mol ，反應速率常數K ＝1.95×10－4／s。在最佳實驗條件下，錸的濃度在0.2～16.00 mg／L範圍內與相對吸光度呈良好的線性關繫，檢齣限為6.0μg／L。用于鉬礦焙燒煙塵中錸含量的測定，相對標準偏差為2.1％～2.9％，標準加入迴收率為95.0％～104％，結果令人滿意。
기우래억제Na2 S2 O8양화내분록B적퇴색반응，결합자외‐가견분광광도법，건립료측정래적신방법。학정료억제체계적동역학조건，병계산료억제반응적표관활화능Ea＝84.65 KJ／mol ，반응속솔상수K ＝1.95×10－4／s。재최가실험조건하，래적농도재0.2～16.00 mg／L범위내여상대흡광도정량호적선성관계，검출한위6.0μg／L。용우목광배소연진중래함량적측정，상대표준편차위2.1％～2.9％，표준가입회수솔위95.0％～104％，결과령인만의。
Based on the coloring reaction of Naphtol green B oxidized by sodium persulfate in the medi‐um of pH 6 .47 phosphate buffer solution inhibited by rhenium ,a new kinetic spectrophotometric method for the determination of trace amounts of rhenium was proposed. The dynamic conditions of the catalytic system was determined and the inhibition reaction apparent activation energy and the reaction rate constant was calculated ,respectively ,Ea=84.65 KJ/mol and K=1.95 × 10-4/s. Under the optimal conditions ,the rhenium concentration showed a good linear relationship with the absorbance in the 0.2 16.00 mg/L range ,the detection limit was 6.0ug/L. The method has been used for the determination of rhenium in roasting chim‐ney of molybdenum minerals. The relative standard deviation was 2.1% 2.9% and the recoveriy was 95.0% 104.0% with satisfactory .
