The EPA estimate for avgas is roughly 500-600 tons of lead annually (depending on the exact estimation factors used). I found an estimate of lead from e-waste

The EPA estimate for avgas is roughly 500-600 tons of lead annually (depending on the exact estimation factors used). I found an estimate of lead from e-waste (all sources of lead, not just solder) being 58,000 tons per year, roughly 100x the avgas figure.