supply of certified raw materials and standard raw materials for use in atomic absorption spectrometer and optical emission spectrometer in chemical testing lab for the year 2020 21 , chemical items : , copper standard solution conc: 1000 mg/l , nist traceable certificate , 1 . 19786 . 0100 , merck / equivalent , 100 ml , cobalt standard solution 1000 mg/l , nist traceable certificate , 1 . 19785 . 0100 , merck / equivalent , 100 ml , tin standard solution 1000 mg/l , nist traceable certificate , 1 . 170242 . 0100 , merck / equivalent , 100 ml , manganese standard solution , 1000 mg/l , nist traceable certificate , 1 . 19789 . 0100 merck / equivalent , 100 ml , potassium standard solution , 1000 mg/l , nist traceable certificate , 1 . 70230 . 0100 merck / equivalent , 100 ml , selenium standard solution , 1000 mg/l , nist traceable certificate , 1 . 19796 . 0100 merck / equivalent , 100 ml , vanaduim standard solution 1000 mg/l , nist traceable certificate , 1 . 70215 . 0100 , merck / equivalent , 100 ml , arsenic standard solution 1000 mg/l , nist traceable certificate , 1 . 19773 . 0500 , merck / equivalent , 100 ml , cadmium standard solution 1000 mg/l , nist traceable certificate , 1 . 19777 . 0100 , merck / equivalent , 100 ml , nickel standard solution 1000 mg/l , nist traceable certificate , 1 . 19792 . 0100 merck / equivalent , 100 ml , standard buffer solution , ph = 4 . 0 at 200c , nist traceable certificate , 1 . 09475 . 0500 , merck / equivalent , 500 ml , standard buffer solution , ph = 7 . 0 at 200c , nist traceable certificate , 1 . 09477 . 0500 , merck / equivalent , 500 ml , standard buffer solution , ph = 9 . 0 at 200c , nist traceable certificate , 1 . 09476 . 0500 , merck/ equivalent , 500 ml , viscosity reference standard oil n 35 ( standard mineral oil ) with certified value from 200c to 1000c9727-c-37 . 016 make :cannon , usa / equivalent , 500 ml , spectroscopic standard for low alloy steel ( disc form ) having certified values for co , ni , nb & b , traceable to national / international standard , spectroscopic standard for copper alloy ( disc form ) having certified values for ag , p , as , sb , bi , se , s , te , al , si , mn traceable to national / international standard , spectroscopic standard for zinc alloy ( disc form ) having certified values for cd traceable to national / international standard , spectroscopic standard for high alloy steel ( disc form ) traceable to national / international standard , spectroscopic standard for aluminium alloy ( disc form ) having certified values for sn traceable to national / international standard