Test Kit Sulphite (Drop Test) 0-150ppm
Sulphite (0-150 ppm) drop test kits use an iodometric titration method, changing color from colorless to blue at the endpoint. Designed for boiler and cooling water, these kits (e.g., Watertest Systems 20-150 ppm) involve adding reagents to a water sample and counting drops until the color change, with each drop typically representing a set ppm value.
Test Kit Sulphite (Drop Test) 0-150ppm
Key Features and Usage for 0-150 ppm Kits
Method: Drop count titration (often referred to as the Ripper method).
Color Change: Colorless/white to blue (or gray-blue).
Procedure: A water sample is typically treated with an indicator (like starch or sulfamic acid to remove interference) and then titrated with a iodide-iodate solution.
Calculation: Total drops
Applications: Used for monitoring oxygen scavengers in boiler water.
Common Kits: Watertest Systems 20-150 ppm and various Lovibond® Drop Test Kits.
Test Kit Sulphite (Drop Test) 0-150ppm
Important Notes
Temperature: Samples should be cooled to room temperature before testing to avoid false high readings (up to 100% error).
Interference: Nitrite can interfere with the test; sulfamic acid is often used to mitigate this.
Typical Kit Components
While specific product images are not directly displayable here, the search results describe the common items included in such a kit. A typical Sulphite (Drop Test) 0-150ppm kit is a titration-based set that includes the following items:
Titration Solution/Reagent A: The main chemical (e.g., potassium iodide-iodate standard solution) used to react with the sulfite in the water sample drop by drop until a color change is permanent.
Indicator Solution(s) / Reagent B & C: Chemicals, such as a Starch Acid Indicator Powder or a liquid indicator like Phenolphthalein Indicator, that produce a clear color change (e.g., from clear to blue/black) at the endpoint of the titration, indicating all the sulfite has reacted.
Calibrated Test Tube/Vessel: A small, clear container (often 5 ml or 10 mL) with volume markings to hold the water sample during the test.
Instructions: A manual detailing the procedure, including how many drops of titrant correspond to the sulfite concentration in parts per million (ppm).
Storage Case: A plastic or cardboard box to keep all the components together.
Hanna Instruments
Test Kit Sulphite (Drop Test) 0-150ppm
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