“…In recent years, many new methods have been reported, including electrochemistry (Chen et al, 2012;Isaac et al, 2006;Karimi-Maleh et al, 2012), ion chromatography (Koch et al, 2010;Zhong et al, 2012), liquid chromatography (Pizzoferrato, 1998;Theisen et al, 2010;S. Wang et al, 2007;Zuo and Chen, 2003), optical chemical sensors or biosensors (Alamo et al, 2010;Dinckaya et al, 2007;Filik and Çetintaş, 2012), flow injection (Navarrro et al, 2010;Ruiz-Capillas and Jiménez-Colmenero, 2009;Tzanavaras et al, 2009).…”