Abstract
Many experiments were made on colorimetric tests in sea-water with “alkali tre, atiaent” and in mixed sea-water of a dilute water-glass solution of known silica content. It is concluded that to estimate the silica content of sea-water the sample must be stand for half a month since bottled, and to correct the salt effect the factor “1.25” should be used as WATTENBERG or ROBINSON showed.
