Instrument Calibration Standard 2, Matrix per Volume 5%HNO3 per 100mL, Concentration of Element: 100mg/mL Ag,100mg/mL Cr, 150mg/mL Mn, 400mg/mL Ni, and 200mg/mL Zn. We recommend a 100-fold dilution with high-quality 5% HNO3. All the solutions you need for daily calibration of your ICP and HGA tor CLP analyses. Remember to prepare your calibration standards fresh for each analysis and discard after use.