Preaparation of Lead Standard Solution (1ppm) For Limit Test

PROCEDURE:

Dilute 1 volume of lead standard solution (0.1 % Pb) to 10 volume with water (i.e.100 ppm  Pb), Dilute 1 volume of lead standard solution (100 ppm Pb) to 10 volumes with water (i.e.10 ppm Pb), further dilute 1 volume of lead standard solution (10ppm Pb) to 10 volumes with    water (i.e.1 ppm Pb).  

OR   Dilute 1ml of lead stock solution (1000ppm) to 1000ml with water.