A series of complexing adsorbents is prepared by coating silica particles with linear polyhexamethylene guanidinium (PHMG) chloride followed by saturation with a number of sulphonated nitrosonaphthols reagents electrostatically retained by positively charged polymer layer. PHMG coated silica is hydrolytically stable even during treatment with 6 M HCl heated up to 50 °C. The adsorption of 1-nitroso-2-naphthol-3,6-disulfonic acid (nitroso-R-salt), 2-nitroso-1-naphthol-4-sulfonic acid (nitroso-N-salt), and 2-nitroso-1-naphthol-3,6-disulfonic acid (nitroso-K-salt) on PHMG modified silica was studied. The effective immobilisation of sulphonated nitrosonaphthols was achieved in the range of pH of 3 - 8, while the adsorption of the monosulphonated reagent (nitroso-N-salt) is twice as high as the disulphonated analogues (nitroso-R-salt and nitroso-K-salt). The adsorption of Cu(II), Fe(III), Co(II), Ni(II), Al(III), Zn(II), Pb(II), Mn(II), and Cr(III) on prepared complexing adsorbents under static and dynamic conditions was studied as a function of time, pH, sample volume, and presence of interfering ions. Metal ions can be desorbed by using 1 M HCl or 1 M HNO₃. The preconcentration factors of metals under optimized conditions are varied from 20 to 80. The developed method was used for the preconcentration of trace metals from natural waters followed by ICP-OES determination. The sub-ppb limits of detection of metals are achieved.

中文翻译：

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在依次涂有聚六亚甲基胍鎓和磺化硝基硝基苯酚层的二氧化硅上进行预浓缩后，通过电感耦合等离子体发射光谱法测定天然水中的金属。

一系列络合吸附剂的制备方法是：用线性聚六亚甲基胍盐（PHMG）氯化物涂覆二氧化硅颗粒，然后用许多带正电的聚合物层静电保留的磺化硝基亚砜试剂进行饱和。即使在用加热到50°C的6 M HCl处理的过程中，PHMG涂层的二氧化硅也具有水解稳定性。1-亚硝基-2-萘-3,6-二磺酸（亚硝基-R-盐），2-亚硝基-1-萘酚-4-磺酸（亚硝基-N-盐）和2-亚硝基-研究了在PHMG改性二氧化硅上的1-萘酚-3,6-二磺酸（亚硝基-K-盐）。在3至8的pH范围内，磺化硝化萘酚的有效固定得以实现，而单磺化试剂（亚硝基N盐）的吸附量是二磺化类似物（亚硝基R盐和亚硝基K）的两倍。 -盐）。制备时对Cu（II），Fe（III），Co（II），Ni（II），Al（III），Zn（II），Pb（II），Mn（II）和Cr（III）的吸附研究了在静态和动态条件下络合吸附剂随时间，pH，样品量和干扰离子的存在而变化的情况。可以通过使用1 M HCl或1 M HNO来解吸金属离子₃。在优化条件下，金属的预富集因子在20到80之间变化。使用开发的方法对天然水中的痕量金属进行预富集，然后进行ICP-OES测定。达到了金属检测的亚ppb极限。