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Diatomaceous earth (/ˌdaɪ.ətəˈmeɪʃəs/ DY-ə-tə-MAY-shəs), diatomite (/daɪˈætəmaɪt/ dy-AT-ə...

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Boron is a chemical element. It has the symbol B and atomic number 5. In its crystalline f...

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Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula Si...

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Spectrophotometry is a branch of electromagnetic spectroscopy concerned with the quantitat...

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Calcium nitrate are inorganic compounds with the formula Ca(NO3)2(H2O)x. The anhydrous com...

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Sulfur (also spelled sulphur in British English) is a chemical element; it has symbol S an...

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An alum (/ˈæləm/) is a type of chemical compound, usually a hydrated double sulfate salt o...

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Humic substances (HS) are colored relatively recalcitrant organic compounds naturally form...

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The western desert of Egypt was a major source of alum substitutes in antiquity. These eva...

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