How will you determine lead and copper in carbon steels using polarographic  method?

The polarographic method is a widely used electro-analytical technique for determining trace metals like lead and copper in various matrices, including carbon steels. This method involves the measurement of the current that flows through a solution as the potential is gradually varied. For the determination of lead and copper in carbon steels, the following steps are typically followed:

### Sample Preparation
First, a representative sample of the carbon steel is prepared by dissolving it in a suitable acid, usually a ______ _____ ________ _______ _______ ____ ____ __________ ______ ________ ______ ______.
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