Determination of diethanolamine and morpholine in systems containing copper(II) using liquid chromatography

Abstract

A method is described for determining 2,2'-i m i no bisetha no1 (diet ha nola m i ne) and tetra hyd ro-I ,4-isoxazi n (morpholine) in a system containing copper(1l). By using a more powerful complex-forming agent, copper(l1) is removed from the sample, and the compounds to be determined are extracted with acid and separated on a strongly acidic sulphonated cation-exchange column with phosphate buffer as the mobile phase. The relative error of the method is less than 5%, the detection limit being 20 p.p.m. for each amine.

Determination of diethanolamine in cosmetics based on micellar extraction in situ derivatization coupled with high performance liquid chromatography

“…The analytical results obtained by the proposed method were compared with those obtained using the methods reported in the literature 9,10,13,14 for determining DEA. The results are summarized briey in Table 1 and indicated that this method provided similar recovery and RSD.…”

“…5 Therefore, an efficient, reliable and sensitive analytical method is indispensable for the detection of DEA. Some techniques, such as gas chromatography (GC), [6][7][8][9][10] high performance liquid chromatography (HPLC), [11][12][13][14] titration, 15 ion chromatography (IC), 16,17 capillary electrophoresis (CE), 18 eld asymmetric ion mobility spectrometry (FAIMS) 19 and spectrophotometry, have already been reported for the determination of DEA or alcamines. 20 Of these methods, titration is the stated standard method used in the chemical industry standard of China for determination of DEA in industrial use (HG/T 2916-1997).…”

“…20 Of these methods, titration is the stated standard method used in the chemical industry standard of China for determination of DEA in industrial use (HG/T 2916-1997). 13 However, this method is time-consuming, labor-intensive and involves complicated procedures. GC is the stated standard method used in China for the determination of DEA in cosmetics (SN/T 2107-2008).…”