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| Tumang,Cristiane Azevedo; Krusche,Alex Vladimir; Victoria,Reynaldo Luis; Richey,Jeffrey Edward. |
| An ion chromatography procedure, employing an IonPac AC15 concentrator column was used to investigate on line preconcentration for the simultaneous determination of inorganic anions and organic acids in river water. Twelve organic acids and nine inorganic anions were separated without any interference from other compounds and carry-over problems between samples. The injection loop was replaced by a Dionex AC15 concentrator column. The proposed procedure employed an auto-sampler that injected 1.5 ml of sample into a KOH mobile phase, generated by an Eluent Generator, at 1.5 mL min-1, which carried the sample to the chromatographic columns (one guard column, model AG-15, and one analytical column, model AS15, with 250 x 4mm i.d.). The gradient elution... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: On-line pre-concentration; Inorganic anions; Organic anions; Ion chromatography; River waters. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000200019 |
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| Hu,Biao; Huang,Kai; Zhang,Xinlin; Zhang,Pingjun; Yu,Shujuan. |
| L-arabinose is widely used in food, medicine, chemistry, and biology fields; however, solubility and seeded metastable zone width (MSZW) of L-arabinose have not been reported in the literature. In this paper, solubility and MSZW of L-arabinose in aqueous solution were determined. Solubility of L-arabinose was measured in the range of 20-68 °C by a conventional equilibrium solubility method and quantitation was determined using the ion chromatography technique. Seeded MSZW was determined in the range of 51-73% by the calorimetric method. The effect of two salts (potassium chloride and calcium chloride) on the solubility and MSZW of L-arabinose were also evaluated. Results showed that both potassium chloride and calcium chloride increased the solubility of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sucrase; Ion chromatography; Potassium chloride; Calcium chloride. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000100051 |
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