AN1163: Determination of Anions on the Surface of Printed Circuit Boards by IPC-TM-650 Method 2.3.28 using HPIC

Instrument Type: IC

Ion chromatography (IC) has become an important technique for the evaluation of ionic cleanliness. This application note describes an IC method using a Thermo Scientific™ Dionex™ IonPac™ AS11-HC-4μm column and a Thermo Scientific™ Dionex™ ICS-5000+ HPIC system to determine extractable anionic contaminants on the surface of PCBs, including inorganic anions and weak organic acids (WOAs) following the extraction procedure described in IPC-TM-650 Method 2.3.28. An ICS-6000 can be used for this application. The addendum shows alternative methods with their benefits and limitations.

AN85: Determination of Trace Anions in (N-Methylpyrrolidone) Organic Solvents

Instrument Type: IC

The determination of trace anionic contamination in processing solvents (N-methyl-2-pyrrolidone (NMP), isopropyl alcohol, and acetone) is important to the electronics industries to minimize corrosion. Here matrix elimination is used to retain and concentrate µg/L anionic contamination in a 5 mL NMP sample onto a concentrator column. NMP is flushed to waste (5 min) with purified deionized water (10 mL). Trace anions are eluted from the concentrator and separated on IonPac AS9-HC column using 8 mM carbonate, 1.5 mM NaOH eluent. AU163 updates AN85 with < 0.2 ug/L lower detection limits.

AN85: Determination of Trace Anions in (Acetone) Organic Solvents

Instrument Type: IC

The determination of trace anionic contamination in processing solvents (N-methyl-2-pyrrolidone, isopropyl alcohol, and acetone) is important to the electronics industries to minimize corrosion. Here matrix elimination is used to retain and concentrate µg/L anionic contamination in a 5 mL acetone sample onto a concentrator column. Acetone is flushed to waste (5 min) with purified deionized water (10 mL). Trace anions are eluted from the concentrator and separated on IonPac AS9-HC column using 8 mM carbonate, 1.5 mM NaOH eluent. AU163 updates AN85 with < 0.2 ug/L lower detection limits.

AN113: Determination of Trace Anions in High Purity Waters by High Volume/Direct Injection Ion Chromatography

Instrument Type: IC

Trace anion determinations are important to the power and the electronics industries. The Electric Power Research Institute (EPRI) recommends using IC to determine concentrations down to 0.25 µg/L, whereas the Semiconductor Equipment and Materials International (SEMI) recommend IC for contaminants from 0.025 to 0.5 µg/L. This application note describes the use of a gradient separation using the IonPac AS11 column for the determination of trace anions by high volume/direct injection. This method is applicable to pure water samples and high-purity waters containing corrosion inhibitors.