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
Email: schalk@unf.edu
Website: @unf

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Y.L. Zhang

Abbrev:
Zhang, Y.L.
Other Names:
Address:
Research Institute, Qilu Petrochemical Company, Zibo 255400, China
Phone:
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Fax:
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Citations 4

"FAAS Determination Of Calcium And Magnesium In Silicon-aluminum Catalyst. Suppression Of Interferences By FIA Technique"
Lihua Jianyan, Huaxue Fence 1998 Volume 34, Issue 1 Pages 28-30
Zhang, Y.

Abstract: A method for FAAS determination of Ca and Mg in Si-Al catalyst with the suppression of interferences by FIA technique was presented. La or Sr solution as releasing agent was mixed with the sample before transfer into a flame atomizer by flow injection pooled band method to eliminate the interferences of Si and Al matrix on the determination Alkali fusion was better than acid dissolution for the anal. of Ca and Mg in Si-Al catalyst.
Calcium Magnesium Silicon aluminum Sample preparation Spectrophotometry Interferences

"FAAS Determination Of Copper And Nickel In Caustic Soda (sodium Hydroxide) With Preconcentration By FIA-coprecipitation"
Lihua Jianyan, Huaxue Fence 1996 Volume 32, Issue 1 Pages 16-18
Zhang Yanlin

Abstract: Sample (10-20 g) was treated dropwise with concentrated HCl to pH 2-3, the cooled solution was mixed with 2.5 mL 100 µg/ml Fe3+, 5 mL 40% NaOH and water was added to 50 mL. The resulting solution was pumped into the flow injection system (described). Cu2+ and Ni2+ were pre-concentrated by coprecipitation with Fe(III) hydroxide. The precipitate was retained on a filter and Cu2+ and Ni2+ were eluted with 2 M HCl and determined by flame AAS at 324.8 and 232 nm, respectively, with corresponding sampling rates of 30 and 60 per h. RSD and recoveries were 6.2% (n = 6) and 98.5%, respectively, for Cu and 3.2% (n = 5) and 95.3%, respectively, for Ni.
Copper(II) Nickel(II) Inorganic compound Spectrophotometry Preconcentration Coprecipitation Filter

"FIA-flame AAS Determination Of Iron In Caustic Soda"
Lihua Jianyan, Huaxue Fence 1994 Volume 30, Issue 1 Pages 9-14
Zhang Yanlin

Abstract: Sample (10 g) was dissolved in 100 mL of water, adjusted to pH 2 with concentrated HCl, and then to pH 4-10 with HCl and NaOH before addition of 1 M HCl (2.5 ml) and water. For FIA, portions of the resulting solution (200 µL) were mixed with a 10-fold excess of Ca(II) (1 mg/ml) and injected into a stream (3.5 ml/min) of 0.1 M NaOH for pre-concentration of the Fe(OH)3 precipitate, which was then eluted with a stream (3.5 ml/min) of 1 M HCl prior to nebulization into the flame for AAS. The detection limit was 105 ng/ml of Fe. The average recovery was 99% and the RSD was 3.4%. Large amounts of interfering ions were removed. The method was simple, rapid and accurate and was used in the analysis of industrial caustic soda.
Iron Industrial Spectrophotometry Interferences Preconcentration Precipitation

"Determination Of Trace Strontium In Natural Mineral Water By Flow Injection - Flame Atomic Absorption Spectrometry"
Fenxi Huaxue 1995 Volume 23, Issue 2 Pages 180-182
Zhang, Y.L.

Abstract: An FIA system (diagram given) was used for the pre-concentration of Sr from mineral water. Sample (100 ml) acidified with one drop of concentrated HCl was passed through (5 ml/min) two columns (1.5 cm x 2 mm i.d.) of 001 x 7 strongly acidic cation-exchange resin. water was used as the carrier stream (3.4 ml/min). Sr was eluted with 2 M HCl (1 ml/min) and determined by flame AAS at 460.7 nm (operating parameters given). The detection limit was 15 ng/l of Sr. Recoveries were 94.4-110.3% and RSD (n = 3) were 0.94% for 60-250 ng/ml of Sr.
Strontium Mineral Spectrophotometry Preconcentration Resin