Noorbasha N. Meeravali and Shiuh-Jen Jiang

J. Anal. At. Spectrom., 2008, 23, 854–860 (DOI: 10.1039/b801427b). Amendment published 25th June 2008

In Fig. 3 the Triton X-114 (% m/v) range is incorrect by a factor of 10. Fig. 3 should appear as:

The subsequent explanation in the text should read:

The concentration of non-ionic surfactant plays a very important role for quantitative extraction of analytes in cloud point extraction process and also decides the pre-concentration factor (PCF) and phase volume ratio (PVR). The PCF is the ratio of the analyte concentration in the surfactant-rich phase to that of the initial aqueous phase and the PVR is the ratio of the final volume of the surfactant-rich phase to that of the aqueous phase. Therefore, optimization of the non-ionic surfactant concentration has been carried out in the range 0.2 to 1.5% m/v of Triton X-114. The recoveries along with corresponding PCF of Pt, Pd and Au are shown in Fig. 3. As shown in Fig. 3, the pre-concentration factors were decreased with increasing the concentration of Triton X-114, while recoveries were increased with increases in the concentration of Triton X-114 in the range 0.2–0.6% m/v. And, they have reached a plateau in the range 0.6–1.0% m/v and decreased beyond. At low concentration of Triton X-114 (0.2% m/v), though the pre-concentration factors were high due to the smaller surfactant-rich phase, the extraction was not quantitative. Therefore, a 0.8% m/v Triton X-114 was selected for further experiments, which has provided the pre-concentration factor of 100, 104 and 105, respectively, for Pt, Pd and Au with a 0.01 phase volume ratio.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

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