Shop › Hach Silica Standard Solution, 1 mg/L as SiO2 (NIST), 500 mL P/N: 110649 Image 1 of 1 Hach Silica Standard Solution, 1 mg/L as SiO2 (NIST), 500 mL P/N: 110649 $63.00 Add To Cart Added! Product Number: 110649For accuracy checks in silica determinations Product Number: 110649For accuracy checks in silica determinations You Might Also Like Hach Silica Reagent Set, Ultra Low Range Rapid Liquid P/N: 2678500 $234.00 Hach Silica Test Kit, Model SI-7 $275.00 Hach Silica Reagents Low Range 0.01-1.60 mg/L P/N: 2459300 $145.00 Hach Citric Acid Reagent Powder Pillows for Silica, 10 mL, pk/100 P/N: 2106269 $49.25 Mettler Toledo Silica Standard Solution 1L 250 ppb P/N: 58078020 $171.25