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A Flow Injection Procedure Using Layered Double Hydroxide for on Line Pre-Concentration of Fluoride

A Flow Injection Procedure Using Layered Double Hydroxide for on Line Pre-Concentration of Fluoride

Diego P Rocha, Gabriel T C Anjos, Thais S Neri, Jairo Tronto, Frederico G Pinto, Sidnei G Silva, Nívia M M Coelho

Talanta. 2018 Feb 1;178:102-108.

PMID: 29136791

Abstract:

This work showed a flow system designed with solenoid valves for preconcentration of fluoride using SPADNS method in water samples. The analyte was preconcentrated in a mini-column coated with Layered Double Hydroxides (LDH) used as adsorbent. Then, the fluoride ions were eluted with 0.5molL-1 sodium hydroxide and determined by spectrophotometry. The variables that affect the system such adsorbent mass, type of eluent, solutions flow rate, reagent concentration and pH effect were critically evaluated. Under optimized conditions, the detection limit, coefficient of variation, linear range and preconcentration factor were estimated at 15µgL-1 (99.7% confidence level), 0.8% (500µgL-1, n = 10), 50-500µgL-1 and 10, respectively. The accuracy of the method was evaluated by analysis of ALPHA APS 1076 (Simulated Rain Water) certified material, the values were not significantly different at a 95% level of confidence. The method was applied for fluoride determination in water samples and the levels found were below the maximum values established by Brazilian environmental and health legislations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
CS3104388	Simulated rain water			Price

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