Keywords: used adsorbent, Ni (II) ion, dimethylglyoxime reagent, sandel sensitivity, quenching coefficient, Tolma-
chyev graph, pH, buffer solution.
Ключевые слова: использованный адсорбент, ион Ni (II), диметилглиоксимовый реагент, чувствительность
по Санделу, коэффициент тушения, график Толмачева, pH, буферный раствор.
______________________________________________________________________________________________
Currently, the production has a significant negative
impact on the environment due to the toxic content of
the adsorbents used as waste in industrial zones. The
methods of analysis of the isolated complex of toxic Ni
(II) ion formed with dimethylglyoxime in the adsorbent
used in this paper are described[4]. Absolute loss of this
ion from the adsorbent was achieved, and the spectral
characteristics of the complex, the method of isomolar
series of the composition of the complex, the equilib-
rium constant were studied [3].
Spectral description
Light absorption spectra were obtained under se-
lected optimal conditions of the complex formed with
dimethylglyoxime reagent and Ni (II).
Process: 2.6 ml of aqueous solution of 0.01% dime-
thylglycosime reagent and 5.0 ml of buffer with pH =
8.0 in a 25 ml volumetric flask, 3.5 ml of a solution of
Ni (II) of 30.0 μg / ml. from the solution and diluted with
distilled water to the mark of the flask. The absorption
spectrum of the resulting complex was measured in a
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май, 2021 г.
87
quartz cuvette with a light absorption thickness of l = 1.0
cm relative to the reference solution, with a spectropho-
tometer SF-46. The absorption spectrum of the reagent
was obtained with respect to distilled water. The results
showed that the maximum absorption area of dimethyl-
glyoxime reagent complex with Ni (II) was located at
λ
comp
= 550 nm, the maximum light absorption area of
dimethylglyoxime reagent was observed in the region of
shorter spectral waves, λ
reagent
= 470 nm.
Using the value of the maximum optical density of
the complex compound (in the area l = 550 nm), the ap-
parent molar extinction coefficient (E
off
) [1] was deter-
mined by the following formula:
Ε off=
𝐴
𝐶
·ℓ (1)
The spectral characteristics of the complex and the
reagent are given in Table 1. The Sendel sensitivity of
the method is 0.001 mcg / cm2. The light absorption is
calculated by the following formula [2]:
S.b.s=
𝑄∗𝐿∗0.0001
𝐴∗25
(2)
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