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Table A2. Continued. . <br /> 1974 14th Ed. <br /> EPA Standard <br />Parameter Unit Method Methods Methods <br /> Page No. Page No. <br />Phosphate, as P mg/1 Manual or automated ascorbic acid reduction 249 481 <br /> 256 624 <br />Potassium mg/1 Digestion followed by atomic absorption, 143 --- <br /> colorimetric or flame photometric --- 235 <br /> --- 234 <br />Selenium mg/1 Digestion followed by atomic absorption 145 159 <br />Settleable Solids mg/1 Measurement 273 95 <br />Silver mg/1 Digestion followed by atomic absorption 146 148 <br /> or colorimetric <br />Sodium mg/1 Digestion followed by atomic absorption, 147 --- <br /> flame photometric --- 250 <br />Sulfate mg/1 Gravimetric, turbidimetric, or automated --- 493 <br /> colorimetric 277 496 <br /> 279 --- <br />Suspended Solids mg/1 Glass fiber filtration, lOSo C 268 94 <br /> <br />