University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Plant -> shrub -> leaves

Citations 1

"FAAS Determination Of Calcium And Magnesium In Gelatin Using The FIA Online Automatic Dilution Technique"
Lihua Jianyan, Huaxue Fence 1996 Volume 32, Issue 2 Pages 82-91
Zhang Min, Chen Shuyu, Lin Shuqin and Cheng Lin

Abstract: Sample (1.2 g) was soaked in 15 mL water for 15 min and digested with 1 mL concentrated HCl, 1 mL concentrated HNO3 and 4 mL H2O2. The digest was diluted with to 25 mL with water for FIA with flame AAS detection of Ca and Mg. Test solution was injected and carried to two sampling loops with a stream of water for alternating feeding, primary and secondary injection volumes being 21 and 70 µL, respectively. The solution was allowed to mix with a stream of 0.3% La solution prior to splitting into two streams by passing through two dilution tubes of 50 and 150 cm in length, respectively, with dilution of 87 to 233-fold, and detection. The peak B of the sets of signals was employed for measurement of Ca whereas the trough E for Mg. Determination was at µg/g level. RSD were 1.3-2.1%. The method was applied to the analysis of wheat, shrimp, pig liver and shrub leaves. Interference from phosphate was overcome. Sampling frequency was 96 runs/h.
Calcium Magnesium Sample preparation Spectrophotometry Interferences Dual injector Sample splitting