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GAGO RODRIGUEZ ET AL. 2512 extracts as pH and exchange calcium content increase. The lowest F in 0.01 M@ CaCl, /F in water ratio was obtained at pHxc higher than 5.5 and exchangeable calcium contents higher than 10cmole, kg ' (Fig. 2b and 2c). Samples having lower pH and higher exchangeable bound contents (>1cmole,kg ') behaved similarly to forest soil samples (Fig. 1b). In these samples, fluorite precipitation

Figure 2 GAGO RODRIGUEZ ET AL. 2512 extracts as pH and exchange calcium content increase. The lowest F in 0.01 M@ CaCl, /F in water ratio was obtained at pHxc higher than 5.5 and exchangeable calcium contents higher than 10cmole, kg ' (Fig. 2b and 2c). Samples having lower pH and higher exchangeable bound contents (>1cmole,kg ') behaved similarly to forest soil samples (Fig. 1b). In these samples, fluorite precipitation

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Table 2. Minimum, Maximum, and Average Values of Fluoride Extracted by Different Extractants
Table 2. Minimum, Maximum, and Average Values of Fluoride Extracted by Different Extractants
2509
2509
2511 Figure 2. Salt solution F/water F ratios as a function of soil pH, exchange Al, o exchange Ca.
2511 Figure 2. Salt solution F/water F ratios as a function of soil pH, exchange Al, o exchange Ca.
Figure 3. Relationship between fluoride extraction by different salt solutions: 0.01 M CaCl, (16:50), 1 M NH,Cl (16:50), and 0.02 M NH,Cl (16:50); O Forest soils; 1 Cropped soils.
Figure 3. Relationship between fluoride extraction by different salt solutions: 0.01 M CaCl, (16:50), 1 M NH,Cl (16:50), and 0.02 M NH,Cl (16:50); O Forest soils; 1 Cropped soils.
2515
2515
2516 One M NH,Cl is more effective than 0.01 M CaCl, and 0.02 M NH,Cl in the whole pH range, from 3.5 to 8.0. Fluoride extracted by 0.01 M CaCl, and 0.02 M NH,CI are very similar and correlate highly throughout the tested pH range.
2516 One M NH,Cl is more effective than 0.01 M CaCl, and 0.02 M NH,Cl in the whole pH range, from 3.5 to 8.0. Fluoride extracted by 0.01 M CaCl, and 0.02 M NH,CI are very similar and correlate highly throughout the tested pH range.
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Fluoride Pollution
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