1. Hem JD. Study and interpretation of the chemical characteristics of natural water, 3rd ed. U.S. Geological Survey Water Supply Paper No. 2254; 1985. Google Scholar

2. Fanning KA, Pilson MEQ. On the spectrophotometric determination of dissolved silica in natural waters. Anal Chem. 1973;45:136–140. Google Scholar

Roy CJ. Silica in natural waters. Amer J Sci. 1945;243(7):393–403. Google Scholar

Vail JG. The Soluble Silicates, Their Properties and Uses. New York (NY): Reinhold Publishing Corp.; 1952, Vol. 1, p. 95–97, 100–161. Google Scholar

1. American Public Health Association, American Water Works Association, Water Environment Federation. In: Eaton AD, Clesceri LS, Greenberg AE, eds. Standard Methods for the Examination of Water and Wastewater. 19th ed. Washington DC: APHA Press; 1995. Google Scholar

Dienert F, Wandenbulcke F. A study of colloidal silica. Compt Rend. 1924;178:564–566. Google Scholar

Swank HW, Mellon MG. Colorimetric standards for silica. Ind Eng Chem Anal Ed. 1934;6(5):346–350. Google Scholar

Tourky AR, Bangham DH. Colloidal silica in natural waters and the silicomolybdate colour test. Nature. 1936;138:587–588. Google Scholar

Birnbaum N, Walden GH. Co-precipitation of ammonium silicomolybdate and ammonium phosphomolybdate. An improved volumetric method for the determination of phosphorus. J Amer Chem Soc. 1938;60(1):66–70. Google Scholar

Kahler HL. Determination of soluble silica in water: A photometric method. Ind Eng Chem Anal Ed. 1941;13(8):536–539. Google Scholar

Noll CA, Maguire JJ. Effect of container on soluble silica content of water samples. Ind Eng Chem Anal Ed. 1942;14(7):569–571. Google Scholar

Schwartz MC. Photometric determination of silica in presence of phosphates. Ind Eng Chem Anal Ed. 1942;14(11):893–895. Google Scholar

Milton RF. Formation of silicomolybdate. Analyst. 1951;76:431. Google Scholar

Killeffer DH, Linz A. Molybdenum Compounds, Their Chemistry and Technology. New York (NY): Interscience Publishers; 1952, pp. 1–2, 42–45, 67–82, 87–92. Google Scholar

Strickland JDH. The preparation and properties of silicomolybdic acid. I. The properties of alpha silicomolybdic acid. J Amer Chem Soc. 1952;74(4):862–867. Google Scholar

Strickland JDH. The preparation and properties of silicomolybdic acid. II. The preparation and properties of beta-silicomolybdic acid. J Amer Chem Soc. 1952;74(4):868–871. Google Scholar

Strickland JDH. The preparation and properties of silicomolybdic acid. III. The combination of silicate and molybdate. J Amer Chem Soc. 1952;74(4):8682–876. Google Scholar

Chow DTW, Robinson RJ. Forms of silicate available for colorimetric determination. Anal Chem. 1953;25(4):646–648. Google Scholar

Bunting WE. Determination of soluble silica in very low concentrations. Ind. Eng. Chem., Anal. Ed. 1944;16(10):612–615. Google Scholar

Straub FG, Grabowski H. Photometric determination of silica in condensed steam in the presence of phosphates. Ind Eng Chem Anal Ed. 1944;16(9):574–575. Google Scholar

Boltz DF, Mellon MG. Determination of phosphorus, germanium, silicon, and arsenic by the heteropoly blue method. Ind Eng Chem Anal Ed. 1947;19(11):873–877. Google Scholar

Carlson AB, Banks CV. Spectrophotometric determination of silicon. Anal Chem. 1952;24(3):472–477. Google Scholar

1. U.S. Environmental Protection Agency. Definition and procedure for the determination of method detection limits. 1989. Appendix B. to 40 CFR 136 rev. 1.11 amended June 30, 1986. 49 CFR 43430. Google Scholar