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Disk Drive

Modern disk drives have very close head-to-disk interfaces, making component cleanliness critical to drive performance and reliability. Anions are potential contaminants of drive components. Ionic contamination can come from several sources: packaging materials, human contact, assembly environment, aqueous rinse solutions, solvents, adhesives, and lubricants. Acetate, formate, acrylate, methacrylate, benzoate, and oxalate can also affect disk performance, so these ions are also of interest. The anions most routinely monitored are fluoride, chloride, bromide, nitrate, sulfate, and phosphate.

Comprehensive anion analysis of drive components prior to manufacturing can significantly reduce the incidence of corrosion and head-to-disk interface failures. High-volume direct injection and preconcentration are the two methods used to increase IC sensitivity to parts-per-billion levels and lower.