Sediment Sampling Methodology

Where possible, sediment should be collected from a depth of 60 cm below the water surface. The sampler should wade into the pond until the desired depth is reached, and then scoop sediments directly into sampling jars, or by using a stainless steel pan. Three individual samples should be collected at each site. Each sample should then transferred to the mixing pan, stirred into a homogenous mixture, and then placed into three separate, pre-labeled glass jars.

Pre-sample Preparations

  • Identify/Locate Sediment Sampling Sites
  • Fill out field data sheet
  • Prepare sampling jars

Clean Sediment Sampling Equipment

  • Put on gloves, rinse gloves with clean water
  • First scrub equipment with sparkleen
  • Rinse with clean water (3×)
  • Rinse with acetone
  • Rinse with hexane

Sediment Sampling Steps

  Fill in the “Location Information” box on the Field Data Form (see example field data sheets)
  Always wear new, clean latex gloves while sampling.
  Thoroughly clean all sampling equipment (mixing tray, spoon, etc.) with metals-free soap and de-ionized water prior to sampling at each site. Where analyses require, use chemical solvents such as hexane and acetone to ensure all residues are dissolved from equipment surfaces.
  Where possible, pond sediments should be collected from a depth of at least 30 cm below the water surface. The sampler should wade into the pond until the desired depth is reached, and then scoop sediments directly into sampling jars, or by using a stainless steel pan.
 

Repeat collection protocol until sufficient sediment volume has been collected to fill the sample jars.

Be sure to record the number of grabs needed at each sample station in the notes section of the field data collection form.


  Using the stainless steel spoon, mix the sediment sample until it is thoroughly combined into a single homogeneous sample in a mixing tray.
 

Transfer representative subsamples of the homogeneous mixture to the clean sample jars, using the mixing spoon. Fill the jar as full as possible with the sample mixture.

If the samples will be frozen, be sure to leave enough space in the jar to allow for water expansion (otherwise, the jars may break).

 

Ensure the label on the container includes the sampling site number, date of sampling, type of sample (sediment), name of project, and is securely fastened to the jar. Place clear plastic tape around label to make it water-resistant.
Complete a final check to ensure that the data sheet has been completed and that all required samples have been collected and are properly labeled. Immediately place collected sediment samples in a cold, dark cooler.

Sample collection in Malaysia
Source: Hatfield Consultants
Hatfield Consultants The World Bank funded by the Canadian POPs Trust Fund through the      
Canadian International Development Agency
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