Open AccessMethodology for Preconcentration and Determination of Silver in Aqueous Samples using Cloud Point Extraction
Author(s) -
Ebaa Adnan Azooz,
Ghusoon Jawad Shabaa,
Emad Abbas Jaffar Al-Mulla
Publication year - 2021
Publication title -
brjac brazilian journal of analytical chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 6
eISSN - 2179-3433
pISSN - 2179-3425
DOI - 10.30744/brjac.2179-3425.ar-61-2021
Subject(s) - cloud point , detection limit , extraction (chemistry) , dithizone , aqueous solution , chemistry , analytical chemistry (journal) , salting out , atomic absorption spectroscopy , chromatography , spectrophotometry , physics , quantum mechanics
For the selective extraction of silver, a cloud point extraction (CPE) procedure was developed. After synthesizing the solvation species through the reaction of silver ions with 2, 4-dimethyl pentane-3-one (2,4 DMP), the salting-out agent (0.4 mol L-1 NaNO3) was added at 35 °C and, after 10 min, Triton X-114 was used to separate silver ions from aqueous solution. The type and quantity of salting-out agent, silver ion, temperature, heating time, and surfactant volume were all examined as important factors determining the CPE. The analytical curve in the 0.1-100 μg L-1 Ag range was straight at optimal conditions. The detection limit (LOD), quantification limit (LOQ), and enrichment factor (E) were 0.05 µg L-1, 0.15 µg L-1, and 200, respectively. The relative standard deviation (RSD) was estimated as 0.2-3.9% (n = 5) in relation to 1, 40, and 80 μg L-1 Ag. Flame atomic absorption spectrometry and spectrophotometry exploiting dithizone were used to assess the CPE accuracy. The proposed approach was then applied to river water, rain water and sand samples.