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Manual abstract: user guide HANNA INSTRUMENTS HI 38067
Detailed instructions for use are in the User's Guide.
[. . . ] Replace the cap, shake and wait for 2 minutes. 8- Remove the cap and add 1 packet of HI 38067C-0 reagent. Replace the cap and shake until the powder has completely dissolved. [. . . ] Silicon is usually reported as silica when rocks, sediments, soil and water are analyzed. Silica is only slightly soluble in water; solubility and form of silica in water depend on pH of water and on the minerals, containing silica, in contact with water. The silica content of natural water is in the 5 to 25 ppm range. It is important to estimate silica concentration in case of some industrial installation such as steam generation and cooling water systems. Note: mg/L is equivalent to ppm (parts per million). 3- Remove the cap and fill the Demineralizer Bottle with tap water. 4- Replace the cap and shake gently for at least 2 minutes. 5- Flip open the top of the Demineralizer Bottle cap. By gently squeezing the bottle, add demineralized 10 mL water to the other vial up to the 10 mL mark. 6- Remove the cap and add 4 drops of HI 38067A-0 reagent. Replace the cap, shake and wait for 7 minutes.
10- Remove the cap and insert the reacted sample into the right hand opening of the checker disc. 11- Hold the checker disc so that a light source illuminates the samples from the back of the windows. 12- Keep the checker disc at a distance of 30-40 cm (1216") to match the color. Rotate the disc while looking at the color test windows and stop when you find the color match.
CHEMICAL REACTION
PRINTED IN ITALY
Determination of silica concentration is an adaptation of the ASTM D859 method of the heteropoly blue method. The reaction between silica and reagents causes a blue tint in the sample which is proportional to the silica concentration.
13- Read the value in the result window directly in mg/L (or ppm) of Silica. 14- If concentration of Silica is higher than 40 ppm, perform the test as follows. [. . . ] Suspended matter in large amounts should be removed by prior filtration. Caution: Ultraviolet radiation may cause fading of colors. When not in use, keep the disc protected from light, in a cool and dry place. [. . . ]
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