University of North Florida
Browse the Citations
-OR-

Contact Info

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

View Stuart Chalk's profile on LinkedIn

Cow Faeces

Classification: Biological material -> faeces -> cow

Citations 4

"Catalytic Determination Of Cobalt By Flow Injection Spectrophotometry Application In Animal Feces Analysis Using Hydrochloric Acid As Extracting Medium"
Anim. Feed Sci. Technol. 1998 Volume 74, Issue 1 Pages 79-84
A. R. A. Nogueira, G. B. Souza, L. A. R. Batista, M. A. Z. Arruda and M. Miyazawac

Abstract: A flow injection system for cobalt determination in feces of bovines and equines receiving Co-EDTA as a tracer in animal nutrition studies is proposed, using 1.0 mol HCl L-1 as extracting medium, and detection by flow injection spectrophotometric procedure based on the catalytic effect of Co(II) on the oxidation of Tiron by hydrogen peroxide. Linearity was observed up to 8.0 Co µg l-1, and the detection limit was 0.2 µg Co L-1 (3s blank). The system requires 0.12 mg Tiron per determination and handles 65 samples hr-1. No baseline drift was observed during extended operation periods (8 h) and precise results (RSD <1%) were detected. Accuracy was confirmed by running several feces samples already analyzed by flame atomic absorption spectrometry. Results related to the HCl extraction procedure were in close agreement with those obtained using the nitric-perchloric digestion (y=0.978x+0.101, R2=0.9848), suggesting that HCl extraction and flow injection determination can be used routinely for rapid anal. of cobalt in feces.
Cobalt Spectrophotometry EDTA Catalysis Indirect Method comparison Extraction

"Rapid Determination Of HClO4-H2SO4 Degradation Nitrogen And Phosphorus In Farm Soils, Crops And Organic Manure Using Flow Injection Analysis"
J. Flow Injection Anal. 1993 Volume 10, Issue 2 Pages 224-235
Hideharu Nakajima *Ryoichi Yanagihara

Abstract: Sample (0.5 g) was decomposed with 25 mL of water, 3 mL of concentrated H2SO4 and 20.5 mL of HClO4 at 130°C for 10 min then heated to fuming at 200°C for 50 min. After cooling, water was added until the total weight was 50 g. To determine N, 30-200 µL of the supernatant was injected into the flow injection analyzer. and carried by a stream of 6% H2SO4 at 0.8 ml/min to mix with 2.5 M NaOH at 2 ml/min in a reaction tube at 30°C prior to reacting with a stream of Tecator NH3 indicator and detection at 590 nm. For P, 30-200 µL of the supernatant was carried by 6% H2SO4 at 2 ml/min to mix successively with 31 g/l of ammonium molybdate solution at 2.8 ml/min, water at 0.8 ml/min and 2% ascorbic acid at 0.8 ml/min with detection at 660 nm. For other samples vanadomolybdic acid was used instead of ammonium molybdate solution and ascorbic acid treatment, with detection at 420 nm. RSD for N and P were 2.1-5.4 and 1.8-8.6%, respectively. The results compared well with those obtained by other conventional methods.
Phosphorus Nitrogen Spectrophotometry Sample preparation Method comparison Tecator

"Rapid Method Of Determination For Total N In The Plants And Organic Manure By HClO4-H2SO4 Digestion-flow Injection Analysis"
Tohoku J. Agric. Res. 1989 Volume 42, Issue NA Pages 169-170
Nakajima, H.;Kawashima, H.

Abstract: NA
Nitrogen, total Sample preparation

"Rapid Method Of Determination For Total Phosphorus In The Crops And Organic Manure By HClO4-H2SO4 Digestion Flow Injection Analysis"
Tohoku J. Agric. Res. 1989 Volume 42, Issue NA Pages 171-172
Nakajima, H.;Kawashima, H.

Abstract: NA
Phosphorus Sample preparation