AOAC OMA# 2011.14 (Final Action Review)-OMB

2011.14 (Oct. 2018) – MTE-03 Final Action Review FOR ERP USE ONLY DO NOT DISTRIBUTE

( e ) Volumetric pipettes.– Class A, glass, assorted sizes. ( f ) Micropipettes.– adjustable, 0.100-1.000 mL and 1-5 mL with disposable plastic tips. ( g ) Dispenser.– capable of dispensing 1-10 mL. ( h ) High-density polyethylene bottles.– for storing standard and sample solutions. ( i ) Water baths.– capable of maintaining 20 ± 2°C and 40 ± 2°C. ( j ) Grinding device. ( k ) ICP-AES spectrometer .—Instrument with axial, radial, or dual view grating configurations and autosampler, capable of determining multiple wavelengths for each element of interest with the required sensitivity. A 3-channel peristaltic pump with or without appropriate in-line addition system (e.g., T connector) linked between the peristaltic pump and nebulizer to avoid manual addition of ionization buffer and internal standards to each sample solution. A thermostated cyclonic spray chamber equipped with a micro-concentric nebulizer or other components designed to optimize aerosol and maximize precision are recommended. Follow manufacturer’s recommendations. Select peristaltic pump rotation speed, sample, and internal standard pump tubes of similar size to maximize mixing accuracy while maintaining the required detection levels. ( l ) Sampler tubes.– for autosampler.

C. Reagents

( a ) High-grade water (18 MΩ) .—ISO 3696 Grade 2, for slurry preparation and/or dilution.