Study of the use of phthalate solution as an eluent in indirect photometric ion chromatography.
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Abstract:
A study to find a better mobile phase for use in the rapid determination of inorganic anions such as fluoride, chloride, nitrite, phosphate, nitrate and sulfate ions by indirect photometric ion chromatography is presented. The eluent optimized was a weak-alkaline (pH 7.3) buffer solution containing 0.7 mM potassium hydrogenphthalate-0.1 mM sodium tetraborate-0.5 mM boric acid-0.1 mM HEPPS-0.05 mM sodium hydrogencarbonate-5 % butanol. The problem of the system peak otherwise encountered was eliminated by judicious choice of the alkalinity of the buffer solution. The eluent did not show any pH drift typically caused by dissolution of carbon dioxide, and was able to separate the phosphate ion completely from the chloride. Whole anions above described were determined within 15 min.Keywords:
Ion chromatography
Alkalinity
Ion chromatography
Tartaric acid
Conductometry
Organic anion
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To establish an analytical method for the determination of 6 kinds of anions in drinking water by ion chromatography(IC),dionex Ion Pac AS-19 anionic chromatography column was used,combined with Dionex Ion Pac AG-19 to protect column,Dionex ASRS suppressor 300 and RFC-30 automatic eluent generator.The eluent was 20 mmol/L KOH while flow rate was 1.0ml/min.Within the certain concentration range,there was a good linear relationship(r0.999),the detection limit was 1.4μg/L ~6.4μg/L,recovery range was 90.2%~106.6%.This method is simple,sensitive and accurate.It can be used as a measuring method of six kinds of anion.
Ion chromatography
Linear range
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The simultaneous determination of fluoride and chloride contents in nickel ore by ion chromatography was established.The sample was decomposed by H2SO4.After water steam distillation at 160-180℃,the fluoride and chloride in testing solution would be released and absorbed by NaOH solution,realizing the separation from matrix and other elements.Then,the contents of fluoride and chloride were determined by ion chromatography.The high-capacity IonPacAS23 anion separation column(4 mm×250 mm) and IonPacAG23 protection column(4 mm×50 mm) were used as chromatographic column and 20 mmol/L NaOH solution was used as eluent.Fluoride and chloride were detected with conductivity detector.The results showed that the peak area of fluoride and chloride had good linear relationship with their contents in the range of 1-25 μg/mL.The correlation coefficients(R) were 1.000 0 and 0.999 6 for fluoride and chloride respectively.The determination results of fluoride and chloride in sample showed high precision.The recoveries of standard addition were all greater than 95%.
Ion chromatography
Thermal conductivity detector
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Ion chromatography
Conductometry
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A method for the determination of common inorganic anions (F-,Cl-,NO2-,NO3-,SO42-,PO43-) in surfacewaters by ion chromatography using directconductivity detection is proposed. Chromatographic separation of common inorganic anions in surfacewaters on a Ionpac AS11-HC anion exchange column (250 mm× 4 mm). Sodium hydroxide are used as eluent. The effects of the types of eluent,eluent concentration,column temperature and flow rate on separation and retention time of the anions are investigated. The optimized chromatographic conditions for the separation and determination of common inorganic anions are as follows:20.00 mmol/L sodium hydroxide as the eluent,column temperature of 18~ 25 ℃ and a flow rate of 1.0 mL/min. The detection limits(S/N=3) of six anions were in range of 0.055～0.61 mg/L. There lative standard deviations(RSD) of the concentrationare as for six anions are from 1.56% to 2.50% (n=3). The method is successfully applied to determinete other inorganic anions in ionliquids.
Ion chromatography
Sodium hydroxide
Inorganic ions
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Ion chromatography
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Ion chromatography
Oxalic Acid
Inorganic ions
Conductometry
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Ion chromatography
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Ion chromatography
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Ion chromatography
Conductometry
Gel permeation chromatography
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