May 23, 2011 - HCl to form aqua regia: 3HCl+HNO3 → 2H2O+NOCl+Cl2. This digestion ... HNO3, HF, HClO4, HCl, and boric acid (H3BO3) were used for digestion and were of ... with 20 mL of 2% HNO3 (v/v with H2O) and transferred into a ...
This article was downloaded by: [B. K. Rajashekhara Rao] On: 04 July 2012, At: 15:18 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK
Communications in Soil Science and Plant Analysis Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/lcss20
Comparison of Three Digestion Methods for Total Soil Potassium Estimation in Soils of Papua New Guinea Derived from Varying Parent Materials a
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B. K. Rajashekhar Rao , John Bailey & Robin Walter Wingwafi
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Department of Agriculture, Papua New Guinea University of Technology, Morobe Province, Papua New Guinea b
National Agricultural Research Institute (NARI), Aiyura, Kainantu, Eastern Highlands Provinces, Papua New Guinea Version of record first published: 23 May 2011
To cite this article: B. K. Rajashekhar Rao, John Bailey & Robin Walter Wingwafi (2011): Comparison of Three Digestion Methods for Total Soil Potassium Estimation in Soils of Papua New Guinea Derived from Varying Parent Materials, Communications in Soil Science and Plant Analysis, 42:11, 1259-1265 To link to this article: http://dx.doi.org/10.1080/00103624.2011.571740
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Communications in Soil Science and Plant Analysis, 42:1259–1265, 2011 Copyright © Taylor & Francis Group, LLC ISSN: 0010-3624 print / 1532-2416 online DOI: 10.1080/00103624.2011.571740
Comparison of Three Digestion Methods for Total Soil Potassium Estimation in Soils of Papua New Guinea Derived from Varying Parent Materials
Downloaded by [B. K. Rajashekhara Rao] at 15:18 04 July 2012
B. K. RAJASHEKHAR RAO,1 JOHN BAILEY,2 AND ROBIN WALTER WINGWAFI1 1 Department of Agriculture, Papua New Guinea University of Technology, Morobe Province, Papua New Guinea 2 National Agricultural Research Institute (NARI), Aiyura, Kainantu, Eastern Highlands Provinces, Papua New Guinea
An estimate of total potassium (K) contents of soils is required to assess the difficultly available fractions of soil potassium. Three digestion procedures were evaluated in terms of recovery of elemental K, precision, and simplicity in combination with analysis of K contents by inductively coupled plasma–optical emission spectroscopy (ICP-OES) in soils derived from contrasting parent materials. A hydrofluoric acid–perchloric acid (HClO4 )–nitric acid (HNO3 ) mixture extracted the most K from 10 soils studied (4809.9 mg kg−1 ) followed by aqua regia (3180.89 mg kg−1 ) and HClO4 –HNO3 mixtures (1206.75 mg kg−1 ). On average, aqua regia and HClO4 –HNO3 digestion methods extracted 66.1% and 25.1% of the K extracted with the HF–HClO4 –HNO3 mixture, respectively. Precision analysis as percentage of relative standard deviation showed excellent precision (
