| http://www.w3.org/ns/prov#value | - Preferred phosphate-containing compounds according to the present invention will include at least one unit of the Formula I: ##STR1## where X is NH4, a Group I metal (e.g., Na, or K), a Group II metal (e.g., Ca), or a Group III metal (e.g., Al), and n is an integer greater than or equal to 1.
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