Part 49

Platinum-cobalt color standard, 9. wire turbidity, 5.

Potassium, determination of, 59.

Presumptive tests, colon group, 102.

Reactions of colon group, 108.

Reaction of culture media, 94. of sludge and mud, 73.

Reduction method (nitrate), 24.

Relative stability method, 71.

Residue on evaporation, 29.

Results, expression of, bacteriological, 103. chemical examination, 14. color, 8. odor, 12.

Results, interpretation of (bacteriological), 106.

Routine procedure (bacteriological), 108.

Samples, bacterial, 93. bottles, 1. chemical, 1. interval before analysis of, 2. quantity required, 1. representative, 3. sludge and mud, 73.

Sewage sludge, analysis, 73.

Silica, determination of, 56.

Soda ash, analysis of, 82.

Soap method (hardness), 31.

Sodium and potassium, 58.

Solids, total, fixed, volatile, 29.

Specific gravity of sludge and mud, 74.

Stability, relative, of effluents, 69. method, relative, 71.

Standards, ammonia, 17. chlorine, 65. color, 9. hardness, 32. iron, 45. Nessler, color, 10. platinum-cobalt, 10. turbidity, 4.

Sterilization of media, 95.

Storage of samples, 2, 98.

Sugars for media, 94.

Sugar broths, 95.

Sulfate, K and Na, 58.

Suspended matter, 30.

Tin, determination of, 54, 55.