Perkin Elmer Pure 1 – 19 components , Perkin Elmer equivalent N9303940, 100mL Ag 50mg/l ; Al 100mg/l ; B 15mg/l ; Ba 5mg/l ; Be 1mg/l ; Bi 200mg/l ; Cd 20mg/l ; Co 20mg/l ; Cr 25mg/l ; Cu 20mg/l ; Fe 15mg/l ; Ga 150mg/l ; In 200mg/l ; Mn 5mg/l ; Ni 50mg/l ; Pb 200mg/l ; Sr 1mg/l ; Tl 400mg/l ; Zn 20mg/l in HNO3 5% – LabKings provide certified standard solutions for both Organics and Inorganics use (traceable to NIST). – These standard solutions are produced by an accredited laboratory according to ISO / IEC 17025 / 17034 (Guide 34) (A2LA). – Quality systems of the manufacturer are tested by NSF-ISR ISO registered (9001: 2008). – All standard solutions come with a Certificate of Analysis (CofA). – All Inorganic single Element standard solutions carry a 18 months shelf life.