The standard solution is certified and can be traced to NIST standard reference materials. 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. Multi Element Standards for ICP-OES (Inductively Coupled Plasma – Optical Emission Spectrometry) All solutions are certified and can be traced to NIST standard reference solutions. Solutions are produced according to ISO 17034 in an accredited environment. The solutions are tested in a laboratory accredited to ISO/IEC 17025 and supplied with a detailed, batch-specific certificate of analysis. A series of mixtures of different element combinations and concentrations for standard environmental analyses.In multi-element solutions, the standard deviation of the respective element concentration is a maximum of 5% of the specified value. Properties: Quality control standards Surface water analysis (Art.No. 2642) Sewage sludge analysis (Art.No. 2643) Multi-Element ICP Standard Solution CR-59 ROTI ® Star 15 elements in 5 % HNO 3 , concentration in mg/l