Anions, Environmental Reference Materials, Inorganics, Water Chemistry CRMs Fluoride CRM #IS-016 $33.00 – $51.00 1000mg/L in Water. Derived from high purity Sodium fluoride, NIST traceable. read more Options Choose an option125 mL500 mLClear Add to cart Compare Catalog Number: IS-016. Options 125 mL, 500 mL Related products Quick View Add to cart Compare $59.00 Environmental Reference Materials Potassium – 125mL #IC-042 Quick View Add to cart Compare $59.00 Environmental Reference Materials Calcium – 125mL #IC-008 Quick View Add to cart Compare $59.00 Environmental Reference Materials Iodide – 125mL #IC-051 Quick View Add to cart Compare $59.00 Environmental Reference Materials Sodium – 125mL #IC-046