The standard solution is certified and can be traced to NIST standard reference solutions. The solution is produced according to ISO 17034 in an accredited environment, tested in a laboratory accredited to ISO/IEC 17025 and supplied with a detailed, batch-specific certificate of analysis. If you need reference standards with special parameters (concentration, matrix, container size etc.) we are offering you our ROTI ® Star multi-element standard solutions as custom-made solutions which are manufactured with your special requirement. Cation Multi-Element IC Standard Solution ROTI ® Star 6 cations (NH 4 + , Ca 2+ , K + , Mg 2+ , Na + , Li + ) in 0,1 % HNO 3 , concentration in mg/l The standard solution is certified and can be traced to NIST standard reference solutions. The solution is produced according to ISO Guide 34 in an accredited environment, tested in a laboratory accredited to ISO/IEC 17025 and supplied with a detailed, batch-specific certificate of analysis.