|Biopak® point-of-use ultrafilter|
|Direct-Q® 3, 5, 8 Water Purification Systems|
|Milli-Q Biocel System,Optimized Ultrapure Water Quality for PCR|
|Milli-Q Element System Water Quality Assessment|
|UV Oxidation in Water Purification|
|Reference overview||Pub Med ID|
|Use of On-Demand High Purity Water to Ensure Accurate TOC Analyses |
C. Weber, B. Gierszewski and S. Mabic
International Labmate (2009) July, 32-33 2009
The organic content of water is referred to as the total organic carbon (TOC) concentration, reported in µg/L or parts per billion (ppb). TOC values below 10 ppb are expected in high purity water used for analytical purposes. To monitor TOC values in water samples in the laboratory, specific TOC analyzers have been designed and developed. These analyzers require running calibration curves and blanks with high purity water that has a very low TOC level, in order to provide meaningful and accurate results. Features of a TOC analyzer suitable for low-level TOC analyses are presented here. Results of blanks and calibration curves obtained using a water purification system delivering low TOC high purity water also are reported, as are data demonstrating how the quality of bottled water quickly degrades over time.Pełny tekst artykułu
|Trace Analysis of Perchlorate: Analytical Method and Removal Efficiency of Purification Technologies |
E. Castillo, E. Riché, I. Kano and S. Mabic
LCGC "The Peak" (2008) August, 21-30. 2008
Perchlorate recently has received attention as an environmental pollutant. Perchlorate may affect human health by interfering with iodide uptake by the thyroid gland and disrupting thyroid function. Perchlorate-free purified water is needed by laboratories analyzing samples for the presence of perchlorates. An ion chromatography method was developed to analyze perchlorate at the ng/L level in high purity water. The perchlorate-removal efficiency of various combinations of water purification technologies also was evaluated. Reverse osmosis alone removed 97 % of the perchlorate. Ion exchange resins and electrodeionization removed all the perchlorate present in water. Using a combination of purification technologies can provide perchlorate-free water suitable for ion chromatography analysis of perchlorate-contaminated samples.
|Trace Analysis of Perchlorate: Analytical Method and Removal Efficiency of Purification Technologies|
|Eradication of Blank Failures in the Five-Day Biochemical Oxygen Demand Test (BOD5) |
C. Fair and E. Riché
Proceedings of the Water Environment Federation, WEFTEC 2008: Session 41 through Session 50 , pp. 3789-3799(11) 2008
The most difficult quality objective to achieve in the five-day biochemical oxygen demand (BOD5) test is to limit oxygen depletion in the blank to less than 0.21 mg/L. Three problem areas contribute to poor blanks (those greater than 0.20 mg/L): poor dissolved oxygen measurement, insufficiently cleaned BOD5 bottles, and poor quality water. The combination of using a luminescent dissolved oxygen probe designed for the BOD5 test (LBOD), disposable polyethylene terephthalate (PET) bottles, and a water purification system eliminates blank failures, when used in conjunction with good laboratory practices.Pełny tekst artykułu
Direct-Q® systems deliver both RO (Type 3) and ultrapure (Type 1) water directly from tap.
With the Direct-Q® range of water purification systems, you benefit from a choice of ultrapure water configurations. All systems produce Type 1 water (18.2 MΩ•cm at 25 °C ultrapure water) on demand from the RO stage, the first step in the purification chain. Depending on daily volume needs, different RO production flow rates are available (3, 5 & 8 L/h). Type 3 water is easily available from the 6L built-in storage tank, or the external 30/60 L storage tanks for the higher flow rates, or can be sent by a distribution pump to feed instruments such as a glassware washing machine.
For applications sensitive to organic contaminants and requiring ultrapure water, a UV version of the Direct-Q® system is also available. It incorporates a dual wavelength UV lamp for photooxidation of organic compounds. A final purification step at the point-of-dispense removes specific contaminants critical for your experiments. A range of purification cartridges and Application-Paks is available for you to select according to your requirements.
Simple handling & maintenance
- Easy installation anywhere in your laboratory with its compact design and optional remote dispenser. Either wall-mounted, on or under the bench, choose the setup that is most convenient for your daily work.
- Dispensing adapted to different size laboratory glassware at an instant flow rate of 0.5 L/min.
- Save time thanks to the volumetric function. It will automatically deliver the water volume that you requested.
- Easily insert your pack in one movement with the patented locking mechanism.
For full confidence in your Direct-Q® system, it is delivered with a Certificate of Conformity ensuring that it has been built and tested fully assembled following internal Standard Operating Procedures. All Direct-Q® consumables are delivered with their Certificate of Quality. The manufacturing site is ISO® 9001 v.2000 and ISO® 140001 certified.
Direct-Q® ultrapure water (Type 1)
|Resistivity at 25 °C||18.2 MΩ•cm|
|TOC (Direct-Q®)||≤ 10 ppb|
|TOC (Direct-Q® UV)||≤ 5 ppb|
|Particulates (size > 0.22 µm)**||<1 Particulate/mL|
|Bacteria**||< 0.1 CFU/mL|
|Pyrogens*** (endotoxins)||< 0.001 EU/mL|
|RNases***||< 0.01 ng/mL|
|DNases***||< 4 pg/µL|
|Flow rate (with Application-Pak final filter)||> 0.5 L/min|
|* In the appropriate test conditions
** With Millipak® final filter
***With Biopak® Polisher
These values are typical and may vary depending on the nature and concentration of contaminants in the feed water.
Direct-Q® RO water (Type 3)
|Ionic rejection||> 96%|
|Organic rejection for MW > 200 Dalton||> 99%|
|Particulates rejection||> 99%|
|Production Flow Rate at 15 °C +/- 15 %||3 L/h (Direct-Q® 3)
5 L/h (Direct-Q® 5)
8 L/h (Direct-Q® 8)
|Feed Water Quality||Potable tap water|
|Feed water connection||½” Gaz M|
|Feed water pressure||0.5 - 6 bar|
|Dimensions (H x W x D)||540 x 290 x 380 mm (21.3 x 11.4 x 15 in)|
|Operating weight (Direct-Q® 3)||17.6 kg (38.8 lb)|
|Operating weight (Direct-Q 3 UV)||18.2 kg (40.1 lb)|
|Operating weight (Direct-Q® 5, 8)||12.2 kg (26.8 lb)|
|Operating weight Remote Dispenser||2.68 kg (5.91lb)|
|Built-in Storage Tank volume (Direct-Q® 3)||6 L|
|Electrical power supply voltage||100 - 250 V +/- 10%|
|Electrical power supply frequency||50 - 60 Hz +/- 10%|
The Direct-Q® system is tested by an independent and accredited company for compliance with the CE directives related to safety and electromagnetic compatibility. The report can be consulted on demand. The Direct-Q® system is built using components and practices recommended by UL and has been cUL marked. The registration can be verified on the UL web site ( http://www.ul.com).