T p chí Khoa h c và Cơng ngh 117 (2017) 073-077

n*, Nguy
i h c Bách khoa Hà N i, S
i C Vi
n Tịa 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 là 11,14%, sai s

i là 2,27%, và
hi u su t thu h
iv in
dung d ch chu
ng chu
ng v i các
kho ng n
10-9-10-8; 10-8-10-7; và 10-7-10-6
c v i h s h i quy tuy n tính R2
c áp d
cu
a bàn Hà N i và 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 và Cơng ngh 117 (2017) 073-077

4

-4

o

2

2 o

-1

-1

-2

4

max


6

2

2-

2

.
2

2

2+
tb

2+

tb
2

2
2+
2

2+

2

2

tb
2+

2+

Ind

Ind
612

o

ch

3.1. Kh o sát

ng s có m t c a các kim lo i
n WInd trong h :
H2O-Me2+-Acry-Ind-H2O2 (II).

-1 -1

2
2+
max

2


T p chí Khoa h c và Cơng ngh 117 (2017) 073-077

2+

3.2. Xây d
2
2+

ng chu n

2+

2

-4

o

2

-2

2 o

2

2

2
2+

2

2+
2+

2

Ind

o

2+

o

2+

o

2+

o

2+

o

2

2+

-6


o

2

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+

7
-9
2+

2+

2+

2+

-9

-9

2+
2


2+

2+
2+

2
2+
2+

2

-9

o


T p chí Khoa h c và Cơng ngh 117 (2017) 073-077
2+
2+

2+

o

9
Ind

Ind

7


Ind

7

2+

9

2+

3.

nh n

2+

mangan trong m u ki m tra.

o
2+

Ind

2+

o

-9


-8
tb

ng mangan trong m t s m u
c.

Ind

2+

o

-8

-7

2+

2+

Ind

2+

o

-7

-6



T p chí Khoa h c và 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].

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T p chí Khoa h c và Cơng ngh 117 (2017) 073-077