Sampling Wastewater - 3 Most Effective Sampling Techniques
Sampling of wastewater is a primary requirement that will help you decide what kind of treatment you should opt for.
In this article I take a look at the 3 most effective sampling techniques: Collection And Preservation Of Samples The sample should be exactly as per the requirement of the sampling wastewater program.
It must not deteriorate nor become contaminated before it reaches the laboratory.
Care should be taken to ensure that analytical results match the actual sample composition.
Important factors affecting results are: The presence of suspended matter and turbidity.
The method chosen for their removal.
Physical and chemical changes brought about by storage or aeration.
It is essential to ensure sample integrity from collection to data reporting.
This includes the ability to trace possession and handling of the sample from the time of collection through analysis and final disposition.
One method is to fix locations for sampling wastewater by detailed description by maps or with aid of stakes, buoys or landmark in a manner that will permit their identification by other persons, without depending on memory or personal guidance.
Type Of Sample (a) Grab or catch sample: a sample collected at a particular time and place.
(b) Composite sample: a sample of grab samples collected at the same point sampling wastewater at different times.
A composite sample representing a 24 hour period is considered standard for most determinations.
Individual portions are collected in a wide mouth bottle having a diameter of at least 35 mm at the mouth and a capacity of at least 120 ml.
Collect these portions every hour; in some cases every half an hour or even every 5 minutes and mix at the end of the sampling period in a single bottle.
If preservatives are used, add them to the sample bottle initially so that all portions of the composite are preserved as soon as they are collected.
(c) Integrated sample: it is a mixture of samples.
Wastewater samples are collected from different points simultaneously for this sampling technique.
In this article I take a look at the 3 most effective sampling techniques: Collection And Preservation Of Samples The sample should be exactly as per the requirement of the sampling wastewater program.
It must not deteriorate nor become contaminated before it reaches the laboratory.
Care should be taken to ensure that analytical results match the actual sample composition.
Important factors affecting results are: The presence of suspended matter and turbidity.
The method chosen for their removal.
Physical and chemical changes brought about by storage or aeration.
It is essential to ensure sample integrity from collection to data reporting.
This includes the ability to trace possession and handling of the sample from the time of collection through analysis and final disposition.
One method is to fix locations for sampling wastewater by detailed description by maps or with aid of stakes, buoys or landmark in a manner that will permit their identification by other persons, without depending on memory or personal guidance.
Type Of Sample (a) Grab or catch sample: a sample collected at a particular time and place.
(b) Composite sample: a sample of grab samples collected at the same point sampling wastewater at different times.
A composite sample representing a 24 hour period is considered standard for most determinations.
Individual portions are collected in a wide mouth bottle having a diameter of at least 35 mm at the mouth and a capacity of at least 120 ml.
Collect these portions every hour; in some cases every half an hour or even every 5 minutes and mix at the end of the sampling period in a single bottle.
If preservatives are used, add them to the sample bottle initially so that all portions of the composite are preserved as soon as they are collected.
(c) Integrated sample: it is a mixture of samples.
Wastewater samples are collected from different points simultaneously for this sampling technique.