The Cascada AN-water System is fed with partially purified water. The unit produces extremely high ultrapure water for critical laboratory applications suitable for all analytical and pharmaceutical applications. No individual semi-volatile organic compounds greater than 25 ppt were found to be present in the product water.

No individual compounds were detected at the minimum detection level of concentrations greater than 25 ppt.

This test method was designed to determine organic compounds in the boiling range of n-heptane
(ca. 100 °C) to n-octacosane (430 °C).

Compounds found to be absent include chlorobenzene, alkyl benzenes, naphthalene and dibutyl phthalate.

In the absence of any detectable compounds, the total ion count was used to estimate the total of components in the following boiling ranges:

Low Boilers     (C7-C10)	Medium Boilers (C10-C20)	High Boilers (> C20)	Total
< 25 ppt	63 ppt	25 ppt	88 ppt

A Cascada AN-water System was fed with water from a Cascada RO-water System with a conductivity of 42 µS/cm and a TOC of 50 ppb C. The unit was operated intermittently and product water dispensed to simulate typical use patterns. Samples were analyzed for semi-volatile organic contaminants.

The organic compounds were trapped on an adsorbent in a sample tube that was subsequently heated to 270 °C for 30 min. The impurities were desorbed into the helium gas stream and cryo-focused in a cold trap before further desorption at 350 °C into a HP6890 GC with a HP5973 quadruple mass selective detector collecting a mass spectrum from 10 to 700 AMU every second. A non-polar poly (dimethylsiloxane) capillary column was used with a program ramping at 10 °C/min from 35 to 280 °C followed by a hold for 10 min. A toluene-d8 internal standard was added.

Method of Analysis: Dynamic Headspace TD-GC-MS (Thermal Desorption-Gas Chromatography-Mass Spectrometry)

Internal Standard: Toluene-d8

Balazs Work Order: 02-01137