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YSI ISE Reagent Certificate of Analysis - Model 7179

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Certificate of Analysis

Company: YSI

Address: 1725 Brannum Lane, Yellow Springs, Ohio 45387-1107 USA

Phone: +1 937-767-7241

Product Information

Product Category: ISE Reagent

Product Model Number: 7179 (100 mg/L Ammonium, 200 mg/L Potassium)

Lot Number: 25H100068

Method: Comparative ISE testing of Production reagent vs. Metrology reagent

Testing Results

Chemistry Tested	Determination	Tolerance	Result
Ammonium	(Average of Production) – (Average of Metrology)	≤ 2 mg/L (2%)	0.76
Ammonium	Coefficient of Variation (CV) for Production reagent	≤ 3%	0.30
Potassium	(Average of Production) – (Average of Metrology)	≤ 4 mg/L (2%)	3.05
Potassium	Coefficient of Variation (CV) for Production reagent	≤ 3%	1.04

The procedures used to manufacture and test this product have been verified by QA for GMP compliance.

Technician: Amanda Fenner

Date: 8/7/2025

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