Uptake of boron by siliceous sinters

The boron content of siliceous sinters is related primarily to the boron concentration in the original solution from which they deposited, and is also affected by their degree of crystallization, as expressed in terms of water content. When the ratio of B/SiO2 in the sinter to B/SiO2 in the solution is denoted by r, then r can be expressed as a function of water content of the sinter: log r=a+b log(H2O), where a and b are constants under given pH and temperature conditions.