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                      歐洲標準(EN ISO 3696-1995)

                      Parameter

                      Grade1

                      Grade2

                      Grade3

                      pH value at 25 °C  inclusive range

                      Not applicable

                      Not applicable

                      5.0 to 7.5

                      Electrical conductivity, mS/m at 25 °C, max.

                      0.01

                      0.1

                      0.5

                      Oxidizable matter Oxygen(O) content mg/l, max

                      Not applicable

                      0.08

                      0.4

                      Absorbance at 254nm and 1cm optical path length, absorbance units, max.

                      0.001

                      0.01

                      Not specified

                      Residue after evaporation on heating at 110 °C, mg/kg, max.

                      Not applicable

                      1

                      2

                      Silica(SiO2) content mg/l, max.

                      0.01

                      0.02

                      Not specified

                       

                       

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