Soil, table

Intrinsic difficulties in sampling truly representative rhizospheric soil (Table 4) have hampered workers searching rhizosphere soil for a number of different enzyme activities as high as in the bulk soil. 

According to the Toxics Release Inventory, in 1996, the estimated releases of lead of 15,147,385 pounds (6,870,738 kg) to land from 1,454 large processing facilities accounted for about 89.4% of total environmental releases (TRI96 1998). An additional 794 pounds (360 kg), constituting less than 0.005% of the total environmental releases, were released via underground injection (TRI96 1998). Also, some of the estimated 370,905,354 pounds (168,239,838 kg) of lead transferred off-site may be ultimately disposed of on land. It should be noted that TRI-reported releases to land include, but are not limited to, releases to soil. Table 5-1 lists amounts released from these facilities. The TRI data should be used with caution, however, since only certain types of facilities are required to report. This is not an exhaustive list. 

The two representative selective sequential dissolution procedures (Bonn and Rehovot procedures) were employed to comparatively study the distribution of trace elements in Israeli arid soils (Table 4.4). The results of both experiments have been fully reported by Banin et al. (1995) and Han and Banin (1995). 

Trace elements can be adsorbed on the surface of calcite, influencing their solubility in calcareous soils of arid and semi-arid zones. The carbonate bound fraction is the major solid-phase component for many trace elements (Cd, Pb, Zn, Ni and Cu) in arid and semi-arid soils, especially in newly contaminated soils (Table 5.3). In Israeli arid soils treated with metal nitrates, the carbonate bound fraction is the largest solid-phase component (60-80%, 50-60%, 40-60%, 30-40%, and 25-36% for Cd, Pb, Zn, Ni, and Cu respectively). Divalent metallic cations at low aqueous concentrations first associate with calcite via adsorption reactions. Then they may be incorporated into the calcite lattice as a co-precipitate by recrystallization (Franklin and Morse, 1983 Komicker et al., 1985 Davis et al., 1987 Zachara et al., 1988 Reeder and Prosky, 1986 Pingitore and... 

Using these routs, we can estimate the MPC values for cadmium in soil (Table 5). 

The situation regarding the determination of elements in sediments is very similar to that occurring in the case of soils (Table 1.12(b)). 

Gladney and Perrin [11] used epithermal neutron activation analyses to determine down to 50ppm total bromine in soils. Excellent agreement with recommended values were obtained for a range of Canadian reference soils (Table 12.4). 

Of the analytical procedures used for the determination of LAS in soils (Table 6.7.1), most methods rely on (Soxhlet) extraction with methanol, followed by clean-up on SPE cartridges (RP-C18 and/or SAX) and final quantitative measurements by HPLC—UV/FL. Applying this protocol, detection limits were achieved ranging between 0.05 and 5 mg kg-1 depending on the matrix, the enrichment factor and the optical detection system employed. 

The distribution of the total N in amino acids, amino sugars and ammonia in soils formed under widely differing climatic conditions was determined by Sowden et al. [4] The soil samples originated from the arctic, cool temperate, subtropical, and tropical regions of the earth s surface. All samples were analyzed by the same methods, which provided a degree of uniformity which had not been attained before and made it possible to gain new insights into the distribution of N in soils. Table 8.1... 

Liming an acidic lake is similar to the process many people use to maintain a pH balance in their soil for lawn maintenance. Plants have an optimum pH range in which they strive. Acidic conditions often develop in soils for several reasons. Rain tends to leach away basic ions, weak organic acids develop from the carbon dioxide produced by decaying organic matter, and strong acids, such as nitric acid, can form when ammonium fertilizers oxidize. To neutralize these acids, different forms of lime such as quicklime, CaO, and slaked lime, Ca(OH)2, are used to neutralize the acid and increase the pH of the soil. Table 13.9 shows how much fertilizer is wasted when applied to... 

Mont = expanding mineral Kaol = kaolinite Sep = sepiolite Palyg = palygorskite Carbonate = secondary carbonate accumulation in the soil. Table modified from Vanden Heuvel (1966). 

Determination of lead and cadmium in tap water and soils TABLE 7.1... 

Earth resistance depends on the type of soil, its mineral composition, moisture content, and temperature. Table 5.2 provides the resistivity of various types of soils Table 5.3, the effect of moisture on soil resistivity and Table 5.4, the effect of temperature on soil resistivity. The information contained in the tables is used to illustrate the effect of various natural factors on soil resistivity. Table 5.5 shows the changes in earth resistance by using multiple ground rods. Note that, to realize the full benefits of multiple rods, the rods should be spaced an adequate distance apart. 

Whereas several specific soil attributes are advocated as being responsible for DOC sorption in the mineral soil (Table V), it appears that the greater the clay or aluminum and iron oxide content of a soil, the greater its adsorptive capacity for DOC. For example, there is a positive correlation between m (the measure of the affinity of a substance for the sorbent or the partition coefficient) and soil clay content, dithionite extractable iron (Fej), and oxalate extractable aluminum (Al0) (Moore et al., 1992 Nelson et al., 1993 Kaiser and Zech, 1998). Direct measurements of the surface area of soil particles also correlate very well with DOC adsorption capacity (Nelson et al., 1993). Furthermore, Nelson et al. (1993) report that riverine DOC concentrations are negatively correlated to the clay content of watershed... 

Suspensions, and to some degree emulsions and foams, play crucial roles in the evolution of the earth s rocks, rivers, streams, lakes, oceans, and soils. Table 9.1 lists some examples. In many cases their role is somewhat disguised in that these colloidal dispersions are the precursors to the ultimate products, the latter having very different final appearances, such as many rocks, sediments, and soils. 

The major element content and mineralogy of air-borne particles reflect closely those of continental soils and shales, although atmospheric particulates also include materials of oceanic origin (Delaney et al., 1967), and show considerable enrichments in some trace metals (Buat-Menard and Chesselet, 1979). The average composition of shales and soils (Table 9.8) was chosen to represent the properties of dust transported from the continents to the ocean. Fluxes of elements in atmospheric transport to the ocean are given in Table 9.14. 

Field soil texture reflects the proportion of sand (2-0.02 mm), silt (0.02-0.002 mm) and clay (< 0.002 mm) in soil (Table 1.2). Field or hand soil texture is determined in the field by the following procedure ... 

Unfortunately there are only limited data available on soil microbial populations that can utilize phenolic acids as a carbon source. The CFU/g soil ranged from 104 to 1010 for bacteria in phenolic acid enriched air-dried soil and not enriched field soils (Table 3.1). However, these numbers of active, quiescent, and/or dormant individuals represent only a small fraction of the bacteria in these soils, since <1% of the viable bacteria in soils can be cultured.43 The assumption is that the CFU based on cultures are representative or consistently related to the... 

The sorption of cyanide ions and copper and zinc cyanide complexes was studied on soils (Table 3.13) and sediments (Table 3.15). Distilled water and natural river water were applied as the solution phase. Sorption was studied by radioisotopic labeling with 14CN ions. 

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