Ammonia vs. Ammonium – what is the difference between these . . . - Hach Ammonia and ammonium are different forms of nitrogen The major factor that determines the proportion of ammonia to ammonium in water is pH The activity of the ammonia is also influenced by ionic strength and temperature It is important to remember as un‐ionized NH 3 can be harmful to aquatic organisms, while ionized ammonium is basically harmless The chemical equation that drives the
Chemistry Explained: Hardness - Hach Traditionally, either murexide indicator (ammonium purpurate) or Eriochrome Blue-Black R indicator is followed by titration with EDTA CalVer 2 Calcium Indicator has been developed by Hach to replace these indicators CalVer 2 (hydroxy naphthol blue) is more sensitive and has a sharper end point color change
What are the possible interferences with the Hydrogen Peroxide . . . - Hach Method information: The first reagent is the ammonium molybdate solution It consists of molybdate and sulfuric acid The molybdate is a catalyst for the reaction, and the acid brings the pH down, which is optimal for the test Then the Sulfite 1 reagent is added This reagent contains potassium iodide and starch (starch iodine redox titration )
What is the best way to prevent contamination when doing TKN and . . . - Hach The process of drying the tubes can contribute to contamination Water droplets pick up ammonium chloride from the air, they evaporate and deposit the salts on the walls of the tubes Minimize the amount of time digestion solutions are exposed to the atmosphere
What does the Amtax sc analyzer actually measure? - Hach The Amtax sc analyzer adds Sodium Hydroxide (NaOH) to adjust the pH and convert ammonium ions (NH4+) to gaseous Ammonia (NH3) which passes through an Ammonia gas selective membrane and causes a pH shift of an electrolyte solution
How can Safety Data Sheets be downloaded for Hach products? Below are the steps for downloading an SDS from most Hach websites: From the Hach website OR from Hach com, go to Support > Safety Data Sheets (SDS) 2 Determine item number from packaging You can choose to search using the following selections for the Item number: "Starts with", "Contains" or "Exact" 3 Select the appropriate Region and Language from the drop-down menus to limit the
Chemistry Explained: Silica - Hach Some forms of silica (usually polymeric) will not react with ammonium molybdate and must be digested with sodium bicarbonate to be converted to a reactive form Silicic acid reacts with water and hydrates as follows: H2SiO3 + 3H2O → H8SiO6 This hydrated silicic acid reacts with molybdate in the presence of acids to form silicomolybdic acid