Labelled 4-Nonyl Phenol Monoethoxylate (N650450). Used as analytical standard for environmental analysis. ISO/CD 18857-2 (International Organization for Standardization, Geneva) describes a new international standard method for the determination of octylphenol, nonylphenol, their mono- and diethyoxylates, and bisphenol A in nonfiltered samples of drinking, groundwater, surface water, and wastewater.
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