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AN72481: Trace Anions by Single Pass AutoNeutralization and Ion Chromatography (IC): Anions in 5% NaOH

Instrument Type: IC

Trace anions determinations in caustic solutions require high dilution to minimize column overload by the caustic sample. However, the high dilutions required prevent analysis of trace anionic contaminants. Here a single pass approach to neutralize the base sample is demonstrated using both suppressors run in recycle mode. The run time was reduced from 45 min in the previous version of this application, AN 93 using “Park and AutoNeutralize” to 12 min. This application is demonstrated on a 5% (w/w) sodium hydroxide sample. An ICS-6000 can be used for this application.

AN72333: Determination of Adsorbable Organic Halogen in Wastewater using a Combustion Ion Chromatography System

Instrument Type: IC

This application note demonstrates that AOX can be precisely and accurately determined in wastewater using combustion ion chromatography. Analysis was automated using the Mitsubishi AQF–2100H system in combination with the Dionex Integrion HPIC system with a Dionex IonPac AS18-4μm column.

AU72331: In-line Sample Preparation for the Determination of Anions in Sodium Hydroxide

Instrument Type: IC

Determination of anions in high pH samples is important for a variety of industries. But anions in a high pH sample cannot be determined without proper sample pretreatment due to the high concentration of hydroxide, which can act as an eluent, in the sample. This record shows an easier method to determine mg/L concentration of anions in sodium hydroxide using automated inline sample preparation with Thermo Scientific™ Dionex™ Guardcap™ H vial caps. The caps serve as a cation exchange cartridge to neutralize samples before loading to the Thermo Scientific™ Dionex™ IonPac AS23-4μm column.

AN72349: Determination of Chlorine, Bromine, and Sulfur in Polyethylene Materials using Combustion Ion Chromatography

Instrument Type: IC

Plastic samples can be very difficult to analyze as sample preparation is required to extract analytes or remove interfering matrices, and these sample preparation techniques can be labor intensive. In this application note, we demonstrate that a CIC system can be used for automated qualitative and quantitative analysis of halogens and sulfur in plastic samples. Four plastic samples were analyzed for their chlorine (Cl), bromine (Br), and sulfur (S) content. Method accuracy was evaluated using a polymer certified reference material (ERM EC680k) for Cl,Br, and S.

AN1089: Determination of Carbohydrates in Acid Hydrolysates of Wood - Method 2

Instrument Type: IC

This work develops methods for the determination of carbohydrates in wood acid hydrolysates using a CarboPac SA10-4μm column, along with a 0.4 µL injection and thicker working electrode gasket. This column contains smaller resin particles, enabling high-resolution, high-efficiency separation, particularly for the rhamnose-galactose that has been challenging to resolve with previous methods. The described method is fast, provides good sensitivity and consistent response, and can be routinely used to determine sugars in wood samples. An ICS-6000 can be used for this application.