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Trong nghiên cứu này, một phương pháp đo quang phổ động học mới đã được phát triển để xác định mangan bằng cách sử dụng Indigo carmine (Ind) làm thuốc thử màu. Phương pháp này đơn giản, nhanh chóng, nhạy và chọn lọc để xác định lượng vết của ion mangan trong nước. Phản ứng oxy hóa Ind bằng H2O2 xúc tác bởi phức Mn2 + với acrylamide (Acry) được theo dõi quang phổ bằng cách đo sự giảm độ hấp thụ của hệ H2O-Mn2 + -Acry-Ind-H2O2 max (612 nm) đã được sử dụng.
T p chí Khoa h c Cơng ngh 117 (2017) 073-077 n*, Nguy i h c Bách khoa Hà N i, S i C Vi n Tòa so n: 20-6-2016; ch p nh n i -02-2017 Tóm t t Trong nghiên c u này, m ng h c tr c quang m c phát tri ng mangan s d ng indigocamin (Ind) làm ch nh ch n l c cao cho vi ng v c Ph n ng oxy hóa Ind b ng H2O2 c xúc tác b i ph c gi a Mn2+ v c theo dõi b ng s gi h p th c a h H2O-Mn2+-Acry-Ind-H2O2 (I) Th i gian c c s d ng Gi i h n max -9 phát hi n c lêch chu i 11,14%, sai s i 2,27%, hi u su t thu h iv in dung d ch chu ng chu ng v i kho ng n 10-9-10-8; 10-8-10-7; 10-7-10-6 c v i h s h i quy n tính R2 c áp d cu a bàn Hà N i k t qu phù h p v i h p th nguyên t (AAS) T khóa: ng h c xúc tác, phân tích v t, mangan, xúc tác ph c, Indigocamin Abstract In this study, a new kinetic spectrophotometric method was developed to determine manganese using Indigo carmine (Ind) as a color reagent This method is simple, rapid, sensitive and selective for the determination of trace amount of manganese ion in water The oxidation reaction of Ind by H2O2 catalyzed by complex of Mn2+ with acrylamide (Acry) was monitored spectrophotometrically by measuring the decrease in absorbance of the system H2O-Mn2+-Acry-Ind-H2O2 max (612 nm) were used The limit of detection was 1×10-9 M The relative standard deviation was 11.14% (n=7), relative error was 2.27 %, and the recovery was satisfactory (102.72%) for the determination of 0.022 mg/L Three linear calibration curves, corresponding to concentration ranges of 10-9-10-8; 10-8-10-7; and 10-7-10-6 M, were obtained with linear regression coefficient R2>0.99 The method was applied to determination of manganese in drinking water in Hanoi, these results were compatible with atomic absorption spectrometry (AAS) Keywords: Catalytic-kinetic, Trace analysis, Manganese, Complex catalyst, Indigo carmine * 2+ * T p chí Khoa h c Cơng ngh 117 (2017) 073-077 -4 o 2 o -1 -1 -2 max 2- 2 2+ tb 2+ tb 2 2+ 2+ 2 tb 2+ 2+ Ind Ind 612 o ch 3.1 Kh o sát ng s có m t c a kim lo i n WInd h : H2O-Me2+-Acry-Ind-H2O2 (II) -1 -1 2+ max T p chí Khoa h c Công ngh 117 (2017) 073-077 2+ 3.2 Xây d 2+ ng chu n 2+ -4 o -2 o 2 2+ 2+ 2+ Ind o 2+ o 2+ o 2+ o 2+ o 2+ -6 o o -9 Ind 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ Ind Ind 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ o 2+ 2+ 2+ Ind 2+ 2+ 2+ 2+ -9 -9 2+ -9 2+ 2+ 2+ 2+ -9 -9 2+ 2+ 2+ 2+ 2+ 2+ -9 o T p chí Khoa h c Công ngh 117 (2017) 073-077 2+ 2+ 2+ o Ind Ind Ind 2+ 2+ nh n 2+ mangan m u ki m tra o 2+ Ind 2+ o -9 -8 tb ng mangan m t s m u c Ind 2+ o -8 -7 2+ 2+ Ind 2+ o -7 -6 T p chí Khoa h c Cơng ngh 117 (2017) 073-077 2+ ng Mn2+ mg/L M u1 M u2 M u3 M u4 M u5 M u6 ng h c xúc tác h p th nguyên t [8] 0,011 0,015 0,110 0,170 0,430 0,457 0,014 0,016 0.118 0,175 0,428 0,463 [9] 2+ -9 -8 -8 -7 2+ -7 2+ 2+ [10] -6 2+ [11] [12] [13] [1] [1] E Grygo-Szymanko, A Tobiasz, S Walas, Speciation analysis and fractionation of manganese a review, TrAC Trends in Analytical Chemistry 80 (2016) 112 124 [2] [2] T Ibusuki, H.M Barnes, Manganese(II) catalyzed sulfur 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Khoa h c Công ngh 117 (2017) 073-077 2+ 2+ 2+ o Ind Ind Ind 2+ 2+ nh n 2+ mangan m u ki m tra o 2+ Ind 2+ o -9 -8 tb ng mangan m t s m u c Ind 2+ o -8 -7 2+ 2+ Ind 2+ o -7 -6 T p chí Khoa h c Cơng... chí Khoa h c Cơng ngh 117 (2017) 073-077 2+ ng Mn2+ mg/L M u1 M u2 M u3 M u4 M u5 M u6 ng h c xúc tác h p th nguyên t [8] 0,011 0,015 0,110 0,170 0,430 0,457 0,014 0,016 0.118 0,175 0,428 0,463... Walas, Speciation analysis and fractionation of manganese a review, TrAC Trends in Analytical Chemistry 80 (2016) 112 124 [2] [2] T Ibusuki, H.M Barnes, Manganese(II) catalyzed sulfur dioxide oxidation