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• W1990865738 abstract "Abstract The application of the modified MCM-41 and SBA-15 nanporous silicas in extraction of trace amounts of palladium is investigated and developed. Surface of nanoporous silicas, MCM-41 and SBA-15, were modified with 9-acridinylamine ligand and then utilized as solid-phase sorbents for the extraction of palladium. Different experimental conditions such as pH, flow rates of the sample, and eluent solution were studied. The type and the smallest amount of eluent for elution were optimized and the breakthrough volume and the influence of various cationic interferences on the adsorption was investigated. The recovery values in this method are greater than 95% and 98.5%. The obtained limits of detections (LOD) are lower than 0.17 ng mL−1 and 0.15 ng mL−1 for SBA-15 and MCM-41, respectively. The pre-concentration factors were calculated to be more than 193 and 187.5 for SBA-15 and MCM-41, respectively. The relative standard deviations (RSD) of the method are lower than 4% and 1.5%, and the adsorption capacities were also obtained to be more than 170 mg g−1 and 195 mg g−1 for SBA-15 and MCM-41, respectively. The proposed procedure was applied on real samples and the amount of palladium was successfully derived. Keywords: 9-acridinylamineMCM-41nanoporouspalladiumSBA-15solid-phase extractionAbbreviations: MCM-41mobile composite material no. 41SBAsanta barbara amorphous Notes a Recovery. b Standard deviation. Conditions: Pd: 5 mg L−1, pH = 7; sample volume, 50 ml; eluent, 7 ml of thiourea 0.2 mol L−1 in HCl solution 2 mol L−1. Sample flow rates 12 and 9, eluent flow rate, 3 for Ac-SBA-15 and Ac-MCM-41. a Nd Not Determined. b Certified concentration of the elements were reported by Geological Survey of Iran (Tehran, Iran)." @default.
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• W1990865738 date "2011-02-25" @default.
• W1990865738 modified "2023-10-09" @default.
• W1990865738 title "Extraction of Ultra Trace Amounts of Palladium on 9-Acridinylamine Functionalized SBA-15 and MCM-41 Nanoporous Silica Sorbents" @default.
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• W1990865738 doi "https://doi.org/10.1080/01496395.2010.528501" @default.
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