Clinoptilolite nano-particles (CNP) were modified by hexadecyltrimethyl ammonium bromide surfactant (HDTMA) and dithizone (DZ). The modified zeolite was then used for the modification of carbon paste electrode (CPE). The resulted CNP-HDTMA-DZ-CPE was finally used for the voltammetric determination of Sn(II) in aqueous solution. The raw and modified CNP was characterized by SEM-EDX, BET, TG-DTG and FTIR techniques. The best voltammetric response was obtained in 0.1 mol L-1 NaNO3 + HCl at pH 2.2 as supporting electrolyte. The electrode showed a linear response in the concentration range of 1 x 10(-8) to 1 x 10(-2) mol L-1 Sn(II) with LOD about 9 x 10(-9) mol L-1 Sn(II). The electrode showed good selectivity and applicability for the determination of Sn(II) in real samples such as river water, an steel company wastewater, tomato paste and a canned tuna fish. (C) 2017 Elsevier Inc. All rights reserved.