Solid Phase Extraction of Inorganic Mercury Using 5-Phenylazo-8-hydroxyquinoline and Determination by Cold Vapor Atomic Fluorescence Spectroscopy in Natural Water Samples

Table 3

Adsorption kinetics of metals in multielement mixture at pH = 4.

Metal	First-order rate constants				Second-order rate constant			Intraparticular diffusion
	𝑄𝑒 (theor) (mmol g^−1)	𝐾1 (min^−1)	𝑅^2	𝑄𝑒 (mmol/g^−1)	𝐾2; (g mmol^−1 min^−1)	𝑅^2	𝑡^1/2	𝐾𝑖	𝑅^2
Co	0,00146	0,00230	0,9533	0,00255	3,283	0,991	119,61	0,00004	0,9427
V	0,00007	0,00299	0,8843	0,00390	137,896	1	1,86	0,000003	0,4423
Cu	0,00004	0,00484	0,8318	0,00315	420,290	1	0,76	0,000001	0,6093
Zn	0,00033	0,00553	0,9541	0,00096	41,447	0,9998	25,04	0,000009	0,6659
Ni	0,00161	0,00345	0,9552	0,00267	4,169	0,9987	89,83	0,00004	0,7309
Fe	0,00193	0,00161	0,7571	0,00350	2,302	0,9993	124,09	0,000008	0,3698
Hg	0,00024	0,00668	0,7452	0,00100	68,596	0,9998	14,52	0,000009	0,4446