X-ray fluorescence analysis was studied to establish a convenient micro-estimation method of phosphorus in water as routine work.0.5mg Fe (Fe (III) salt solution) was added to 100ml of sample water, which was then adjusted to pH 6-7 to coprecipitate phosphorus with Fe (III) hydroxide floc. The settled floc was gathered onto a millipore filter and measured its XF intensity.The relationship between orthophosphate-P (C_p) and its XF intensity (I) was represented by the following equation.I=I₀+I_u(C_p)ⁿ where, I₀: XF intensity at C_p=0, I_u: XF intensity at unit concentration of phosphorus, n: exponent.
Orthophosphate-P was estimated over the range of concentration from 10 μg/liter to 1.8 mg/liter. By applying the same procedure as in the orthophosphate estimation pyrophosphate-P and tripoly-phosphate-P could be estimated over the range of concentration from 10 μg/liter to 0.6 mg/liter and 10 μg/liter to 1.0 mg/liter, respectively.It was also showed that this method could be applied to estimate the concentration of phosphorus in sea water, brine and bittern in the process of the salt manufacture.

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