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Sampling technique including utilize of sampling form
- 1. Sampling technique including utilize of sampling form Presented by : Md. Aminur Rahman Senior Chemist DPHE, Zonal Laboratory, Khulna.
- 2. Sampling Technique and Sampling Form Purpose of Proper Sampling Technique – • To determine the Chemical, Physical and Biological characteristic of water in respect to its suitability for a particular purpose such as cooking, drinking for the protection of human health or suitable for aquatic plant & animal trough analysis. • Timely detection and/or prediction of drinking water contamination are critically important in protecting the environment and the economy.
- 3. Purpose of Proper Sampling Technique • Result of water quality analysis will be valueless if the samples are not properly collected and stored. It has important consequences for sampling rules, sampling procedures and method of sample preservation and storage. To use of recommended sample bottle with proper clean / sterile, use of proper preservatives during sampling, minimize sample transportation time etc are the factor to produce authentic water quality test results.
- 4. Type of container for Sample Collection • Sample should be collected by : - Borosilicate Glass ware - High density Polyethylene bottle - Other Specified Plastic Container -Sample bottle must be Cleaned and sterile.
- 5. Labeling of Sample Container • Sample should be labeled properly and it should be water proof Label should have the following information: • Tube well ID • Sample number • Collection date • Collection time • Collection place (GPS Reading) • Preservative if any. • Well depth.
- 6. Contents of Sampling Form • Sampling form should have the following information: • Tube well ID • Caretakers name • Address • Age of the well • GPS Reading • Parameter to be analyzed • Well depth • Name and signature of the sample collector • Send the sampling form together with the sample to the respective laboratory
- 7. Activities During Sample Collection • Wash your hand with the well water. Uncap the sample bottle. Do not touch inside of the bottle or cap and do not put down either the cap or the bottle until the sampling is completed. • Rinse the bottle and cap three times with the well water (Before sample collection) coming from the spout by filling the bottle half full, cap it and shake it. Do not rinse the bottle in the bucket water.
- 8. • At first, fill up relevant information in the sample collection form • Take GPS Reading and record it. • Pump the well minimum for five minutes. • Now measure Temperature, pH, color, Taste, Odor, turbidity, EC, TDS, Salinity with the help of portable meter and record it in the "Sample Collection Form".
- 9. Sample Storage & Transportation • The time between Sampling and analysis should be kept to a minimum. However, if the sample is required to store it should be: • At low temperature (4˚ to 10˚ C) in the dark place. • Time of transport should be less than 4 hours for Microbiological test.
- 10. Process of Preservative Use • Fill the container to within 2-3 cm of the top and add 6-8 ml Conc. HCL or HNO3/L to the Sampling bottle for pH <2. Add additional water until the bottle is full to the brim and cap tightly.
- 11. Non-preservative sample • Just fill the bottle without any gap, storage at 4˚ C in the dark and analyze immediately.
- 12. Sample Collection for Bacteriological Analysis • Sterilize the pump outlet for a minute with the flame by a gas burner, lighter or an ignited alcohol-soaked cotton- wool swab. • Again Pump the tube well and allow the water to flow for one-two minutes at a medium flow rate. Unscrew the cap of the sterilized sampling bottle. Immediately hold the bottle under tube well outlet (spout) and fill with water. A small air space should be left to make shaking before analysis. Screw the cap and keep in the sample box with ice pack). • Time of transport should be less than 4 hours or Cool box with ice pack or portable Microbiological Testing instrument should be carry in the field to conduct the Bacteriological test.
- 13. Sampling Form Name of the project: Organization: Sample No.: Date: Time: Mouza: Union: Upazila: Dist: Latitude: N: Longitude: E: Sample Type: GW SW Source: DW/HTW/STW/DTW/MW/PW River/Pond/Lake Depth: Model of collection: Pumped/Sampler Onsite Measurements: Temperature: 0 C EC: µS/cm pH: DO mg/L% Samples: F/A F/UA UF/UA Onsite observations: Sample collected by: Supervised by:
- 14. Thank you for your co-operation