HI3873 Nitrite Test Kit The HI3873 is a colorimetric chemical test kit that determines the nitrite concentration in samples within a 0.0 to 1.0 mg/L (ppm) range as nitrite-nitrogen (NO«¯—N). The HI3873 is supplied with all of the necessary reagents and equipment to perform the analysis. The test kit contains enough reagents for perform approximately 100 tests. • Complete setup · All required materials are included with the test kit, such as the glass cuvette, color comparison cube, and reagent packets. • High resolution · Readings from 0.0 to 1.0 mg/L are determined to 0.2 mg/L resolution. • Replacement reagents available · There is no need to buy a new kit when reagents are exhausted. The HI3873-100 can be ordered to replace the reagents supplied with the kit. Signicance of Use Nitrites can be harmful to aquatic organisms even in low concentrations and for this reason, they are closely monitored in aquaculture facilities. In cooling towers, however, an adequate amount of nitrites is necessary to prevent corrosion. In high concentrations, they can be harmful to the environment and to humans. They are, therefore, normally monitored to verify the quality of water for domestic use, as well as lakes and ponds. Nitrites are an intermediate product in the nitrogen cycle and are produced by ammonia oxidation with water, or even originate in industrial waste directly. They must not be present in drinking water. Specifications HI3873 Nitrite (as NO«¯—N) Type colorimetric Range 0.0-1.0 mg/L (ppm) Smallest Increment 0.2 mg/L (ppm) Method chromotropic acid Number of Tests 100 avg. Ordering Information HI3873 test kit comes with 100 packets nitrite reagent, glass cuvette and color comparison cube. Reagent HI3873-100 nitrite (as NO«¯—N), 100 tests avg. HI3810 Dissolved Oxygen Test Kit The HI3810 is a titrationbased chemical test kit that determines the dissolved oxygen concentration within the 0 to 10 mg/L O« range. The HI3810 is supplied with all of the necessary reagents and equipment to perform the analysis. The test kit contains enough reagents for perform approximately 110 tests. • Complete setup · All required materials are included with the test kit, such as the glass stoppered bottle, indicator and reagent bottles, and calibrated syringe. • High resolution · Readings from 0 to 10 mg/L are determined to 0.1 mg/L resolution. • Replacement reagents available · There is no need to buy a new kit when reagents are exhausted. The HI3810-100 can be ordered to replace the reagents supplied with the kit. Signicance of Use The concentration of dissolved oxygen in water is extremely important in nature as well in man’s environment. In oceans, lakes, rivers, and other surface water bodies, dissolved oxygen is essential to the growth and development of aquatic life. Without oxygen, water can become toxic due to the anaerobic decaying of organic matter. In man’s environment, water must contain at least 2 mg/L of oxygen to protect water pipes from corrosion. However, boiler system water, in many cases, cannot contain greater than 10 mg/L oxygen. A modied Winkler method is used in the HI3810 test kit. Manganous ions react with oxygen in the presence of potassium hydroxide to form a manganese oxide precipitate (Step 1). An azide is present to prevent any nitrite ions from interfering with the test. With addition of acid, manganese oxide hydroxide oxidizes the iodide to iodine (Step 2). Since the amount of iodine generated is equivalent to the oxygen in the sample, the concentration of iodine is calculated by titration of thiosulfate ions that reduce the iodine back to iodide ions (Step 3). Step 1: 2Mn¯+ + O« + 4OH¯ → 2MnO(OH)« Step 2: MnO(OH)« + 2I¯ + 4H+→ Mn¯+ + I« + 3H«O Step 3: I« + 2S«O¦¯² → 2I¯ + S¬Oů² Specifications HI3810 Dissolved Oxygen Type titration Range 0.0-10.0 mg/L (ppm) Smallest Increment 0.1 mg/L (ppm) Method modified Winkler Number of Tests 110 avg. Ordering Information HI3810 test kit comes with 30 mL manganous sulfate solution, 30 mL alkali-azide reagent, 30 mL sulfuric acid solution (2), 10 mL starch indicator, 120 mL titrant solution, glass bottle with stopper, 10 mL calibrated vessel and calibrated syringe with tip. Reagent HI3810-100 dissolved oxygen, 100 tests avg. Chemical test kit reagents begin on page 9.44 9 Chemical Test Kits 9.26 | www.hannainst.com
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