Tender For supply of laboratory crm srm - nitrate standard solution 1000 ppm , phosphate standard solution , ammonium standard solution , bod standard solution , calcium standard solution 1000 ppm , chloride standard solution , cod calibration standard , fluoride standard solution 1000 ppm , nitrite standard solution 1000 ppm , potassium standard solution 1000 ppm , sodium standard solution 1000 ppm , sulphate standard solution 1000 ppm , color standard solution 500 hazen