Simple procedure for ion chromatographic determination of anions and cations at trace levels in ice core samples

Improved Method for the Determination of Inorganic Anions in Roselle (Hibiscus sabdariffa L.) by Suppressed Ion Chromatography

“…Table 1 and fig 2 indicate that the retention volumes decrease with increasing the flow rate, Also the shortest retention volume was obtained with the flow rate 0.9 ml/min for all the ions under studies, moreover the results revealed that the excellent separation of inorganic anions under investigation obtained by using flow rate 1 ml/min for F -, Cl -, NO -2 , Br -, SO 2-4 and I -and it gave more repeatability than other flow rate studied, in addition the separation at flow rate 1 ml/min revealed that there are overlap between NO -3 and HPO [2][3][4] ,section 3.5 will discuss the solution of this problem.…”

“…The effect of concentration of potassium carbonate in the eluent on the retention volumes of mono and divalent anion F -, Cl -, NO -2 , Br -,NO -3 , HPO [2][3][4] ,SO [2][3][4] , and I -was investigated for the simultaneous separation of these anions. ,SO [2][3][4] , and I -while it is slightly decrased for F -, Cl -and NO -2 , with increasing the concentration of potassium carbonate, also the shortest retention volumes was obtained with the concentration of 1.75 mM potassium carbonate for [2][3][4] appeared at the concentration of 1.8 mM potassium carbonate.…”

“…,SO [2][3][4] , and I -while it is slightly decrased for F -, Cl -and NO -2 , with increasing the concentration of potassium carbonate, also the shortest retention volumes was obtained with the concentration of 1.75 mM potassium carbonate for [2][3][4] appeared at the concentration of 1.8 mM potassium carbonate. The solution of this overlap will be discuss in the ETHTC effect section.…”

“…Also the results revealed that the most efficient separation of inorganic anions under studies (except NO -3 and HPO 2-4 ) was obtained with the pH 9.24. The solution of the overlap between NO -3 and HPO [2][3][4] will be discuss in section 3.5.…”

“…On the other hand our studies involve the separation of eight anion include F -, Cl -, NO -, SO [2][3][4] and I -and the time of separation is 12.21 minutes. The results suggest that our method gives better results than that done by Lamb et al 4 , Pera et al 25 and Kumar et al 26 .…”