Comparison of the Ignition Method and the Perchloric Acid Digestion Method for the Determination of Total Phosphorus in Agricultural Soils of Taiwan

Abstract

The ignition method and the perchloric acid (HClO 4 ) digestion method for the determination of total phosphorus (P) content in 65 agricultural soils of Taiwan were compared. The average amount of total P obtained by the ignition method was 4.3% less than that obtained by the HClO 4 method. There was a wide range of variation, from 37% less to 21% more in the ignition method than those results obtained by the HClO 4 digestion method. Because the ignition method can also be used for the estimation of soil organic P and is thus worthy of further study, it should be adopted as a routine procedure.

The Influence of Municipal Solid Waste Compost on the Tranformations of Phosphorus Forms in Soil

“…In most cases, the Pt-H2SO4 values are lower; in CPT-9, the value was slightly higher than the Pt-HClO4 value. These data are comparable with data reported in the literature [3,42]. Other authors have found that dry combustion followed by P extraction in 0.5 M H2SO4 slightly underestimated Pt, which was attributed to incomplete oxidation of organic matter, volatilization of P, and formation of insoluble P crystals during dry combustion at 550 °C [64,65].…”

“…The following phosphorus forms were determined in the research material: the total content of P after digestion in concentrated HClO 4 [41,42] in the aluminium block at a temperature of 130 • C (P t ); the content of organic P (P org ), calculated from the differences between the P content measured in 0.5 M H 2 SO 4 extracts of the samples burned in a furnace at 550 • C for 2 h (P t ) and samples not subjected to burning (P min ) [43]; the P oxalic-oxalate extractable (P ox ), according to Tamm method, using a mixture of 0.175…”

Effect of Furrow Straw Mulching and Straw Decomposer Application on Celery (Apium graveolens L.) Production and Soil Improvement

“…Soil and water were mixed at a mass ratio of 1:1, and soil conductivity was determined after shaking for 1 h [40]. Soil total organic carbon content was determined via the potassium dichromate oxidation method [41], soil nitrate nitrogen content was determined via UV absorption spectrometry [42], soil total phosphorus content was determined via the perchloric acid ablation method [42], and soil total potassium content was determined via flame photometry [43]. The available phosphorus was determined via the sodium bicarbonate method, and the available potassium was determined using atomic absorption spectrophotometry [44,45].…”