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Solid-phase extraction and determination of erythrosine in water using aluminum oxide column

Yahya S.Al-Degs, Rajab Abu-El-Halawa, Samer S.Abu-Alrub

A novel use of aluminum oxide for Erythrosine E127 preconcentration from water is reported. E127 is effectively adsorbed by aluminum oxide column and eluted using small amount of tetrahydrofuran. Under the studied extraction conditions, 100 µg/L of E127 was quantified with high accuracy (98%) and precision (%RSD 8). A high enrichment factor (113) is obtained by the proposed extraction procedure which is necessary for trace analysis. Using principal component analysis, the %recovery of E127 is correlated to the experimental factors as: %recovery = 0.09 (Samp Vol) + 0.19 (Mass) + 0.59 (Eluent Vol) – 0.17 (pH). The PCA revealed that eluent volume, aluminum oxide mass, and sample volume are positively correlated with %recovery while pH is negatively correlated with %recovery. The most significant factor on E127 preconcentration from water is the eluent volume with a coefficient value of 0.59. The extraction procedure was effective for determination of E127 in tap water at 100 µg/L.