scholarly journals Determination of dissolved reactive and dissolved total phosphorus in water extract of soils

2011 ◽  
Vol 57 (No. 1) ◽  
pp. 1-6 ◽  
Author(s):  
J. Matula
Keyword(s):  
Agricultural Soils ◽  
Water Extract ◽  
Phosphorus Level ◽  
Total Water ◽  
Testing Laboratory ◽  
Molybdenum Blue ◽  
Dissolved Phosphorus ◽  
Soil Water Extract ◽  
Simplified Procedure

The simplified acid peroxydisulphate digestion of soil water extract was evaluated for determination of total dissolved phosphorus by molybdenum-blue colorimetry in comparison with direct P-detection in water extract by the ICP-AES technique. The research was conducted on 79 agricultural soils with different agrochemical characteristics. The results of the colorimetric P detection in water extract without digestion and ICP phosphorus detection were different. The median of values determined by ICP-AES was 1.7 times higher than that of colorimetry, but the correlations between the two measurements were quite close (r = 0.993). Differences between the colorimetric phosphorus and ICP-AES phosphorus were irregular, increasing as the phosphorus level in soils decreased. The simplified procedure of acid peroxydisulphate digestion is useful for routine determination of total water-extracted phosphorus in soils when the soil testing laboratory is not equipped with the ICP-AES technique. The two-tailed paired t-test did not prove any difference in the values between the direct ICP-AES P-detection in water extract of soils and colorimetric P-detection in the acid peroxydisulphate digest.  

Determination of fluoride in soil water extract by ion chromatography with column-switching technique

2016 ◽  
Vol 34 (4) ◽  
pp. 442
Author(s):  
Xinhua JIANG ◽  
Chengzhu NI ◽  
Binhe ZHU ◽  
Xunyan ZHAO ◽  
Suqing CHEN ◽  
...  
Keyword(s):  
Soil Water ◽  
Ion Chromatography ◽  
Water Extract ◽  
Column Switching ◽  
Soil Water Extract

scholarly journals Sensitive On-site Reflectometric Determination of Phosphorus by Collection of Molybdenum Blue on a Membrane Filter

2017 ◽  
Vol 66 (9) ◽  
pp. 687-692
Author(s):  
Yuya HASEGAWA ◽  
Yasutada SUZUKI ◽  
Susumu KAWAKUBO
Keyword(s):  
Membrane Filter ◽  
Molybdenum Blue

scholarly journals Total Water Content of Mainstream Smoke and Sidestream Smoke / Über den Wassergehalt von Haupt- und Nebenstromrauch

1966 ◽  
Vol 3 (5) ◽  
Author(s):  
G. Neurath ◽  
H. Ehmke ◽  
H. Schneemann
Keyword(s):  
Volatile Compounds ◽  
Combustion Process ◽  
Vapour Phase ◽  
Total Water Content ◽  
Mainstream Smoke ◽  
Total Water ◽  
Sidestream Smoke ◽  
Large Water ◽  
Convection Stream

AbstractThe present paper gives a balance of total water (comprising moisture content of tobacco as well as water of combustion) in the smoking of a plain cigarette without filter under standard conditions. 62.8 % of the hydrogen originally present in the burnt portion of the cigarette are transformed into water. The sidestream smoke is enriched by the total water to a large extent, i.e., in proportion to the total water of a cigarette, 14.4 mg of water are calculated to be transferred to the mainstream smoke and 344.7 mg to the sidestream smoke and to the ashes. 14.6 % of the said hydrogen are found to be delivered into the condensates of main and sidestream smoke in the form of slightly volatile compounds containing hydrogen. The residual 22.6 % are transferred into the gas-vapour phase in the form of volatile compounds. The interpretation of temperature measurements made along the axis of and in the space above a freely smouldering cigarette (without drawing) as well as the determination of the velocity (33 cm/sec) of the escaping sidestream smoke indicate the presence of a rapid and steep convection stream over the glowing zone. This finding accounts for the large water enrichment of the sidestream smoke and for the fact that water formed by the combustion process does not contribute to the transfer of steam-volatile substances into the sidestream smoke.

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