PH value of soil

Texture, organic matter content, oxygen status and pH values of soil in use area(s) Amqlmts and timing of precipitation Temperature and solar irradiance in use area(s) (temperate vs. tropical vs. nordic)... 

Interestingly, the pH value of soil will alter the color of certain flowers. 

Table 4.1. Concentration of Hg and Co,g and pH values of soil samples of the mining area Idrija, Slovenia (data after Hess 1992)...

Determination of the pH Value of Sludge, Soil, Mud and Sediment and the Lime Requirement of Soil (Second Edition) (by Determination of the pH Value of Sludge, Soil, Mud and Sediment or by Determination of the Lime Requirement of Soil), 1992... 

The most commonly observed effect of current flow is the development of alkaline conditions at the cathode. On bare metal this alkaline zone may exist only at the metal surface and may often reach pH values of 10 to 12. When the soil solution contains appreciable calcium or magnesium these cations usually form a layer of carbonate or hydroxide at the cathodic area. On coated lines the cations usually move to holidays or breaks in the coating. On failing asphalt or asphalt mastic type coatings, masses of precipitated calcium and magnesium often form nodules or tubercles several centimetres in diameter. 

Chemical compatibility studies with hydraulic conductivity tests must be performed over a long enough period of time to determine the full effects of the waste liquid. Termination criteria include equal inflow and outflow of liquid, steady hydraulic conductivity, and influent/effluent equilibrium. At least two pore volumes of liquid must be passed through the soil to flush out the soil water and bring the waste leachate into the soil in significant quantities. Reasonable equilibrations of the influent and effluent liquids occur when the pH values of the waste influent and effluent liquids are similar and the key organic and inorganic ions are at full concentrations in the effluent liquid. 

In terms of Eh-pH, what limits the nonbiological range of Eh-pH values in soil ... 

The diffusion parameter calculated by the root time method is an average parameter, and is generally considered to be operative over the range of time from initial diffusion flux to near steady state flux conditions. The method is applicable for the situation where adsorption and desorption occur, and for various pH values of the influent. The closer (DE) is to (DB) in Fig. 5 d, the greater is the accuracy of the D coefficient. It is important to note that in the case of low pH values of the influent, desorption of cations from a clay soil could produce conditions where C2 > C1. Accordingly, the experimental values for relative change in concentration would then become negative. 

Hydrolyzes in soil and water to carbofuran phenol, carbon dioxide, and methylamine (Rajagopal et al, 1986 Seiber et al, 1978 Somasundaram et al., 1989, 1991). Hydrolysis of carbofuran occurs in both flooded and nonflooded soils, but the rate is slightly higher under flooded conditions (Venkateswarlu et al., 1977), especially when the soil is pretreated with the hydrolysis product, carbofuran phenol (Rajagopal et al., 1986). In addition, the hydrolysis of carbofuran was found to be pH dependent in both deionized water and rice paddy water. At pH values of 7.0, 8.7, and 10.0, the hydrolysis half-lives in deionized water were 864, 19.4, and 1.2 h, respectively. In paddy water, the hydrolysis half-lives at pH values of 7.0, 8.7, and 10.0 were 40, 13.9, and 1.3, respectively (Seiber et al, 1978). 

CASRN 52315-07-8 molecular formula C22H19CI2NO3 FW 416.30 Soil. The major soil metabolite was 3-phenoxybenzoic acid (Hartley and Kidd, 1987). Chemical/Physical. The hydrolysis half-lives of cypermethrin in a sterile 1% ethanol/water solution at 25 °C and pH values of 4.5, 6.0, 7.0, and 8.0, were 99, 69, 63, and 50 wk, respectively (Chapman and Cole, 1982). 

CASRN 13684-56-5 molecular formula C16H16N2O4 FW 300.32 Soil. Degrades in soil forming the intermediate 3-hydroxycarbanilate (Worthing and Hance, 1991). The reported half-lives in soil are 70 d, 20 h, and 10 min at pH values of 5, 7, and 9, respectively (Worthing and Hance, 1991). 

Calculating the bicarbonate concentrations with (3), it is possible to plot the measured average pH values of Table 2 against the calculated loglHCOs ]. The result is shown in Fig. 5a. For pH >5.5 a linear relationship, very close to that reported in the literature, can be observed (pH = loglHCOa ] + 11.2). However, for acid lakes the calculated bicarbonate concentrations seem to be too low. It is reported that at pH<6 the release of metals from soils or sediments as a consequence of weathering processes becomes more and more important. Consequently aluminium hydroxides can influence alkalinity. In [18] the equation for calculating alkalinity was modified as follows ... 

The pH of the morama bean soils (0-120 cm) collected from Namibia ranged from 5.08 0.08 to 6.90 0.26. A significant difference was found between morama bean soils from Sandveld Sites 1 and 2, and Buitepos, and nonmorama bean soils from Sandveld Site 4. The soils from Botswana showed mean pH values of 5.04 0.21 to 7.40 0.25 for morama bean-growing areas and 4.04 0.03 to 4.89 0.16 for... 

On the other hand, at a pH value of 5.0 there were no large differences in the strength of bonds between humic acids and metals such as Ca, Mg, Mn, Co, Ni, and Zn, whereas bonds with Pb, Cu, and Fe were stronger than with other metals (Schnitzer and Kahn, 1972) this behavior indicates that at different pH values, metal humic substance complexes of different stability are formed in the soil. This aspect is of particular relevance in an environment such as the rhizosphere, where dynamic pH gradients are present mainly due to the availability of nutrients and to their selective uptake by roots. With regard to plant availability, great importance lies in the molecular dimension and solubility of humic substances (Briimmer and Herms,... 

A wide variety of soils and sludge have now been treated. Soil characteristics that can impact the SET chemistry include the general soil type, which is treated (loam, sand, silt, and clay), the presence of humic material, the pH value, the soil s cation exchange capacity, its particle size, the amount of water present, and the iron content. Processes have been engineered to accommodate this wide range of variables [7,8,34]. Some soils can be treated... 

The increased soil C02 partial pressure of 1 vol% - compared to atmospheric P(C02) = 0.03 vol% - causes an increase in the concentration of the H+ ions (see chapter 3.1.1.6). Thus, the pH value of the rainwater decreases from 5.1 to 4.775, while at the same time the concentration of dissolved carbon increases from 13 pruol/L to 390 pmol/L. 

---