Hach QbD120 laboratory TOC analyser

The Hach QbD1200 laboratory total organic carbon (TOC) analyser implements the UV/persulfate oxidation method, which combines acid and oxidiser into a single reagent. This reagent can be purchased as a concentrated stock solution or prepared by the user following the simple recipe provided.

This oxidation chemistry — combined with a digital NDIR detector featuring a highly stable semiconductor IR light source and automatic baseline correction — results in good measurement reproducibility. Careful attention to the plumbing and flushing of this wet chemistry has virtually eliminated sample-to-sampler carryover, removing the need to discard the first measurement in a series of replicates.

Fast and convenient validation and qualification procedures have been designed. 8-point calibration, with six concentrations and three replicates, takes 90 min and is fully automated. A 10.4″ colour touch screen provides step-by-step instructions on how to perform all common operations, and no external PC is required.

The product is offered with a robust auto sampler capable of holding up to 64 standard 40 mL glass sample vials, with additional standard bays for qualification tests. Dynamic endpoint detection algorithms are employed to ensure that all inorganic carbon is removed prior to oxidation of organic species and complete oxidation of organic species is achieved. No additional inorganic carbon removal module is required.