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An innovative nano‐sorbent for selective solid‐phase extraction and spectrophotometric determination of p ‐amino benzoic acid in cosmetic products
Author(s) -
AbdolmohammadZadeh H.,
Falaghi S.,
Rahimpour E.
Publication year - 2014
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/ics.12107
Subject(s) - sorbent , chemistry , solid phase extraction , extraction (chemistry) , detection limit , chromatography , benzoic acid , spectrophotometry , elution , nitric acid , sorption , hydroxide , aqueous solution , adsorption , nuclear chemistry , inorganic chemistry , organic chemistry
Synopsis Objective A novel nano‐sorbent was developed for selective extraction and pre‐concentration of p ‐amino benzoic acid ( PABA ) prior to determination by spectrophotometry. Methods Selective extraction of PABA from aqueous solutions was performed using a solid‐phase extraction column packed with 200 mg of nickel–zinc–aluminium layered double hydroxide (Ni‐Zn‐Al LDH) as a nano‐sorbent. Extraction procedure is based on the adsorption of p ‐amino benzoate ions on the Ni‐Zn‐Al‐nitrate LDH and/or their exchanging with LDH interlayer nitrate ions. After elution of extracted analyte by 2.5 mL of 2 mol L −1 NaCl solution, its concentration was determined spectrophotometrically at λ max = 268 nm. Results The spectrophotometry method gave a linear response for PABA within the range of 12.5–425.0 μ g L −1 with a correlation coefficient of 0.9994. In the optimum experimental conditions, the limit of detection and sorption capacity were 3.78 μ g L −1 and 21.25 mg g −1 , respectively. Conclusion The presented method uses mild separation conditions and is a sensitive, reproducible, simple, low‐cost and environment‐friendly technique that could be used for the extraction and determination of PABA in various cosmetic samples.