Determination of Iodate in Food, Environmental, and Biological Samples after Solid-Phase Extraction with Ni-Al-Zr Ternary Layered Double Hydroxide as a Nanosorbent

Table 2

Optimum conditions and analytical performance of the presented method for iodate determination.

Experimental conditions	Unit
Working pH	—	5.5
Amount of Ni-Al-Zr LDH	(mg)	200
Sample volume	(mL)	50
Sample loading flow rate	(mL min^−1)	3
Eluent concentration	(mol L^−1)	2
Eluent volume	(mL)	1.5
Elution flow rate	(mL min^−1)	1
Iodide concentration	(mol L^−1)	0.1
Detection pH	—	2.5
Final volume	(mL)	2.5
Wavelength	(nm)	352
Analytical parameters	Unit
Linear range	(μg mL^−1)	0.2–2.8
Intercept	—	0.0389
Slope	—	0.4184
Detection limit^a	(μg mL^−1)	0.12
Correlation coefficient	—	0.998
Relative standard deviation (𝑛=6)^b	(%)	2.5 (0.5)
Enrichment factor^c	—	20

^aCalculated as three times the standard deviation of the blank signal.
^bValue in parentheses is the iodate concentration (μg mL⁻¹) for which the RSD was obtained.
^cEnrichment factor calculated as the ratio between the volume of the initial aqueous solution and the final elution volume.