i need protocol from the specification for marine monitoring- part 4: sea water analysis. Tia
Salim H. Jassam
Collect the water sample in a clean and dry glass bottle and fill it to the top to avoid air bubbles. Add a small amount of manganese sulfate and sodium hydroxide to the water sample to remove any hydrogen sulfide or other reducing agents. Titrate the sample with a standardized iodine solution using a burette until the sample turns light brown. The iodine solution should be added until the sample turns completely brown. Add a few drops of starch solution to the sample to act as an indicator. Continue to titrate the sample with the iodine solution until the blue color appears. Record the volume of iodine solution used. Calculate the dissolved oxygen concentration using the following formula: Collect the water sample in a clean and dry glass bottle. Add potassium hydroxide to the water sample to make it alkaline and to release the ammonia nitrogen. Add a small amount of phenolphthalein to the sample to act as an indicator. Titrate the sample with a standardized iodine solution until the color of the sample changes from pink to colorless. Record the volume of iodine solution used. Calculate the ammonia nitrogen concentration using the following formula:
Iodometric Method for Dissolved Oxygen
Dissolved oxygen (mg/L) = (Volume of iodine solution used x 0.025) / Volume of water sample
Iodometric Method for Ammonia Nitrogen
Ammonia nitrogen (mg/L) = (Volume of iodine solution used x N x 1.4) / Volume of water sample
Where N is the normality of the iodine solution.
Note: These protocols are provided as general guidelines and should be adapted based on the specific requirements and procedures of the laboratory.
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