Drinking Water Application Notes

1. Chlorine Method For UKAS Accreditation And DWI Compliance At Welsh Water
   4/13/2017

   In 2013 the Drinking Water Inspectorate for England & Wales announced that water samples collected in England and Wales must be tested in a laboratory that meets specific standards for drinking water sampling and analysis. At the time of the new instruction, the chlorine method employed at the Welsh Water Bretton laboratory was unable to meet these requirements, notably for the prescribed limit of detection. This prompted the laboratory to investigate new analytical options for monitoring residual chlorine.

2. Determination Of Polar Pesticide Residues In Food Of Plant Origin, By And Automate QuPPe Solution
   9/29/2014

   The QuEChERS (Quick-Easy-Cheap-Effective-Rugged-Safe) sample extraction method was developed for the determination of pesticide residues in agricultural commodities.

3. Wireless PRV Monitoring Application Note
   11/21/2013

   Pressure reducing valves (PRVs) are used throughout water distribution systems to reduce pipeline pressure to a predetermined set point. This decreases water loss and prevents pipe breaks.

4. Degassing Boiler Feed Water in China with 3M™ Liqui-Cel™ Membrane Contactors
   7/6/2017

   ShenLan Environment Inc. located in Shanghai, China uses 3M™ Liqui-Cel™ Membrane Contactors in their boiler feed water treatment systems. These systems realize lower operating costs with the added benefit of reducing the chemicals added to the boiler feed water.

5. Application Note: Low-Flow Sampling Of Water Quality Parameters Used In Determining Groundwater Stability
   1/20/2010
   In April 1996, the U.S. EPA developed and published a document entitled Low-Flow (Minimal Drawdown) Ground-Water Sampling Procedures. The document states that “the most common ground water purging and sampling methodology is to purge wells using bailers or high speed pumps to remove 3 to 5 casing volumes followed by sample collection.” Adverse impacts can occur through this method affecting sample quality by increasing levels of turbidity. These problems can often be mitigated by using low-flow purging and sampling to reduce sampling-induced turbidity. By YSI
6. Application Bulletin: Reverse Osmosis
   3/19/2008
   Osmosis is the phenomenon of lower dissolved solids in water passing through a semi-permeable membrane into higher dissolved solids water until a near equilibrium is reached
7. The Importance Of Measuring Total Organic Carbon
   4/13/2017

   Organic carbon compounds vary greatly. In fact, one of the first lessons in most introductory Organic Chemistry courses explains that the number of possible carbon compounds is virtually infinite due to carbon’s ability to form long, chain-like molecules. While chromatographic methods like gas chromatography (GC) or high-performance liquid chromatography (HPLC) are able to make quantitative determinations for specific compounds, the user must first know which specific compounds to look for.

8. Determination Of Pesticide Residues In Tea
   4/10/2015

   In 2012, Americans consumed well over 79 billion servings of tea, which is just over 3.60 billion gallons.

9. Preliminary Assessment Of Water Quality In Riviera Grise Near Port-Au-Prince, Haiti
   10/17/2012

   The Riviera Grise drains water from the Cul-de-Sac watershed, Haiti, which covers most of the rural areas along the flood plains and areas that extend into steep hillsides. It also covers urban areas of Port-Au-Prince, the capital city of Haiti.

10. Bringing Efficiency And New Confidence To BOD₅ Analysis
    2/4/2013

    Biochemical Oxygen Demand (BOD) analysis is the test everyone loves to hate—and for compelling reasons.