Reference Material for Aqueous Suspended Matter Solution 500mg/L

**Reference Material Specification** This certified reference material is intended for daily analysis, detection, environmental monitoring, food testing, confirmation of relevant standards and methods, and can also be used for laboratory quality control such as method evaluation and instrument calibration. **I. Sample Preparation** This reference material is prepared using solutes of high-purity substances with accurately determined purity, dissolved in ultrapure water. It is accurately formulated by gravimetric-volumetric method in a clean laboratory at room temperature (20±3)°C. **II. Traceability and Value Assignment** The certified value of this reference material is verified by a certified value, with value verification performed using gravimetric analysis. Traceability of reference material values is ensured through preparation, measurement methods, and metrological instruments that meet metrological characteristic requirements. **III. Characteristic Values and Expanded Uncertainty** | Component | Certified Value | Expanded Uncertainty (k=2) | Matrix | |----------------|-----------------|----------------------------|-----------------| | Suspended Solids | 500 mg/L | 36 mg/L | Ultrapure Water | The expanded uncertainty of certified values is primarily synthesized from uncertainties in raw material purity, weighing, volume measurement, homogeneity, and long-term stability. **IV. Homogeneity Test and Stability Assessment** According to JJF 1343-2022 "Value Assignment and Evaluation of Homogeneity and Stability for Reference Materials", the homogeneity and stability of the material were monitored. Results confirm good homogeneity and stability. Valid for 12 months from value assignment date. The developing unit will continue monitoring stability and notify users of any changes during validity period. **V. Packaging, Storage and Usage** **Packaging:** Polyethylene plastic bottles. Protect from breakage during transport. **Storage & Usage:** Store sealed at room temperature. Equilibrate to (20±3)°C and shake thoroughly before use. Strictly prevent contamination during use. **Declaration:** 1. For laboratory research and analytical testing only. Complaints arising from improper use/storage are not our responsibility. 2. Verify product type, quantity, and packaging immediately upon receipt. Compensation limited to the reference material itself. 3. For usage information, contact technical consulting department.