Published by James McDonald, PE, CWT, Technology and Marketing Manager at Chem-Aqua, Inc. in Academic
Category: Academic
Sampling is the heart of the analysis. The main objective is to collect the representative sample. One can have grab sample if there is no variation. Other wise continuous or intermittent sampling can be done to have fair representation. Please inform whether the sample is to be drawn from close conduit pipe of from the open channel.
Published by Rajendrakumar Saraf
- Follow proper safety precautions
- Prevent samples contamination
- Maintain proper sample custody
- Preserve samples properly
- Use proper container
- Observe DOT or IATA regulations when shipping samples
- Take notes
- Take time to; establish samples required based on type of study to be performed, select sampling ports, establish quality control, define if grab or composite samples are required, define sampling length and frequency.
- Take time to understand the system to sample; continuous, batch, peak load, etc.
- Clean and calibrate sampling equipment
Published by Alfonso J. Sol Salinas
If you are analyzing water for trace metals, please make sure the sample bottles are plastic based (Teflon or polypropylene) and add as much pure concentrated nitric acid (metal free) so as to reduce the sample to pH < 2. Please refer to Standard Methods for the Examination of Water and Wastewater for more details on sample bottle preparation, the procedure during collection, and preservation until analysis. Agreed, the objective of sampling and constituents in water to be analyzed would further narrow down specific steps. Agee with suggestions already provided by colleagues in the group.
Published by Krishna Kumar Nedunuri
Sample extraction method is important. You must adhere to strict protocols to be certain the sample is representative of the stream being sampled. ASTM has several publications regarding proper techniques.
Published by Norris Johnston, Owner and Principle Consultant at Water Wizard Consulting, LLC
Contamination is the biggest problem when performing sampling. Avoid foreign contact (i.e hand contact) with samples when taking sample at sampling points. Try to avoid aerating the sample (i.e., don't allow water to "bubble" into the container.
Published by Lerato Moroe, -Plant Chemist at ENGIE (CorrISA)
Use either the same bottles daily for the same samples, or use new ones constantly, which is a real pain. Also make sure that samples which are air sensitive are filled and sealed solidly full, or better, fill them underwater.
Published by James Stewart
dear james as you have mentioned that the samples sensitive to the air, which kind of samples are sensitive to air??? if possible can you make anyone of the examples.
Published by Mohammad Baquir, Research Scholar Environmental Engineering at Aligarh Muslim University, Aligarh, India
1st need to specify the objective of sampling. Then study the system to find the related area of system considering objective specified for study. The sampling point to be selected based probability to authenticated the information for the study or finding to conclude.
Published by brajendra Singh, Regional Head at Ion Exchange India Limited
Essentially try to measure the minimum pH parameters at the site, preferably store them in glass containers, keep them well refrigerated and sealed
Published by Ruben D. Hidalgo, Ing. Químico