Reference

Determination of nonionic surfactants by a method using ammonium tetrathiocyanatocobaltate

Determination of nonionic surfactants by a method using ammonium tetrathiocyanatocobaltate. Pitter, Pavel; Sulcova-Banovicova, Jarmila (VSCHT, Prague, Czech.). Sb.In this study， 25804-08-4 and 37205-87-1 are also used. Vys. Sk. Chem.-Technol. Praze, [Oddil] F: Technol. Vody Prostredi, F24, 147-58 (Czech) 1982. CODEN: SVSFDD. ISSN: 0139-9632. DOCUMENT TYPE: Journal CA Section: 46 (Surface Active Agents and Detergents) Section cross-reference(s): 80 The sensitivity of the spectrophotometric detn. of polyoxyethylene chain-contg. nonionic surfactants in water using the title agent (I) [25804-08-4] was significantly increased using 1,2-dichloroethane [107-06-2] for extn. of the complex formed from the surfactant and I. It is recommended to prep. I by dissolving 620 g NH4SCN and 280 g Co(NO3)2.6H2O in 1000 mL water, to use sample-I vol. ratio 5:2, to conduct the extn. 3 times, and to det. the absorbance of the ext. at 610 mm. The method is applicable for samples contg. ~5-50 mg surfactant/L water; the relative std. deviation of the method is ~2.5 mg/L. .

The extraction of zinc(II) from hydrochloric acid solutions by high-molecular weight quaternary ammonium salt in various diluents

The extraction of zinc(II) from hydrochloric acid solutions by high-molecular weight quaternary ammonium salt in various diluents. Sato, Taichi; Kuwahara, Masami; Nakamura, Takato (Fac. Eng., Shizuoka Univ., Hamamatsu 432, Japan). Proc. Symp. Solvent Extr. Met., 1-6. Shizuoka Univ., Fac. Eng., Dep. Appl. Chem.: Hamamatsu, Japan. (English) 1981. CODEN: 50NWAS. DOCUMENT TYPE: Conference CA Section: 54 (Extractive Metallurgy) The distribution coeff. was examd. as a function of temp. in the extn. of Zn from chloride solns. by trioctylmethyl ammonium chloride [5137-55-3]. The effect of solvents benzene [71-43-2], chlorobenzene [108-90-7], o-dichlorobenzene [95-50-1], toluene [108-88-3], m-xylene [108-38-3], nitrobenzene [98-95-3], CCl4, and 1,2-dichloroethane [107-06-2] was studied. The thermodn. data estd. from the distribution results are compared with the heats of reaction detd. by calorimetry. The distribution of Zn between aq. and org. phases can be interpreted by assuming a regular soln.Except for chemicals metioned above, 98-95-3 and 71-43-2 are also used. .