559
Volume 5, Issue 10: Special Issue
(EJAR)
ISSN: 2181-2020
MPHAPP
THE 6TH INTERNATIONAL SCIENTIFIC AND PRACTICAL
CONFERENCE
“
MODERN PHARMACEUTICS: ACTUAL
PROBLEMS AND PROSPECTS
”
TASHKENT, OCTOBER 17, 2025
in-academy.uz
ANALYSIS OF TOXIC METALS IN DAIRY PRODUCTS USING THE
VOLTAMMETRY METHOD
Asrorova Z.
Yaxshieva Z.Z.
Jizzakh State Pedagogical University, Jizzakh city, Republic of Uzbekistan
https://doi.org/10.5281/zenodo.17344286
Introduction.
Dairy products are widely consumed by humans and represent an important
source of proteins, fats, and minerals for the div. Unfortunately, due to environmental pollution,
these products may also contain toxic metals along with other harmful substances. The accumulation
of toxic metals in dairy products at elevated levels poses a serious threat to food safety and human
health. Therefore, determining the amount of toxic metals in dairy products is of great importance. In
this study, the contents of toxic metals such as lead (Pb) and cadmium (Cd) in certain dairy products
were determined using voltammetry, and the results were compared with the permissible hygienic
limits.
Objective of the study.
To determine the concentration of toxic metals in biokefir, kefir,
yogurt, curd (suzma), and sour milk (qatiq) samples using a rapid, convenient, and cost-effective
voltammetric method.
Materials and Methods.
The study was conducted on biokefir, kefir, yogurt, curd (suzma),
and sour milk (qatiq). A 4 g portion of each sample was weighed on an analytical balance. To remove
organic matter, the samples were first heated in an open flame. The resulting black residue was then
calcined in a muffle furnace for 10 hours to obtain white ash. To the ash, 2.5 ml of a background
solution and 0.4 ml of 0.4% HCl solution were added, mixed, and filtered into a 25 ml volumetric
flask. Distilled water was added up to the mark. The prepared solution was analyzed using the
“Volta
1.1” voltammetric analyzer
, and the concentrations of toxic metals were determined by the
voltammetry method.
Results and Discussion.
The voltammetry method demonstrated high sensitivity and allowed
the detection of trace amounts of toxic metals in dairy products. The concentrations of cadmium and
lead determined in the samples are presented in the table below.
Toxicmetal
Curd (suzma)
(mg/kg)
Kefir
(mg/kg)
Yogurt
(mg/kg)
Sour milk
(qatiq) (mg/kg)
Biokefir
(mg/kg)
Pb
0.230
0.090
0.052
0.015
0.010
Cd
0.0829
0.0001
0.047
Notdetected
0.002
According to the data, both Pb and Cd showed the highest concentrations in curd (suzma). The
lowest concentration of Pb was found in biokefir, while the lowest Cd concentration was observed in
kefir. Cadmium was not detected in sour milk (qatiq).
Conclusion.
The obtained results confirm the presence of toxic metals in certain dairy products,
indicating the necessity of their continuous monitoring. Moreover, voltammetry has proven to be an
effective and reliable method for determining toxic metals in dairy products. The detection of toxic
metals in biokefir, kefir, yogurt, curd, and sour milk highlights the importance of strengthening food
safety monitoring and enforcing stricter sanitary regulations.
