#### Handy Andy

##### Senior Member

I need a little help with some simple math.

I have a small barrel with 50litres of wine and a lingering feint rotten egg smell, after it had been splash racked twice and left for a couple of weeks.

I read that the addition of copper sulphate up to a maximum of 0.5ppm or 0.5mg/litre can be used to remove hydrogen sulphide smells.

I thought I would do some tests at a dosing level of 0.1ppm and work my way up to 0.5ppm dose to see what worked.

I ordered CuSO4.5H2O copper sulphate crystals. Then I realized my kitchen scales will not weigh anything less than 1 gram.

How much CuSO4.5H2O do I need to dissolve in water to produce a solution that can be dropped into my wine at a sensible rate.

My dropper is 0.05mL or 20 drops to a 1mL

If I take 5g of CuSO4.5H2O (teaspoon) and mix with 500ml of water gives 10g/litre or 10000ppm solution of CuSO4.5H2O and water.

Am I correct in thinking???? > adding 0.1mL, 2drops of 10000ppm solution to 1 litre of wine is equivalent to dosing at 1ppm??? or is it 0.1ppm

Thanks in advance

Edit

Thinking about this overnight. I think ive worked it out.

1gram dissolved in 1litre gives me a solution of 1000ppm approx.

1mL (20 drops) of this solution dissolved in 1 litre of wine gives 1ppm which is too high maybe even toxic.

1mL of solution dissolved in 10litres of wine gives 0.1ppm

1mL of solution dissolved in 50 litres of wine gives 0.02ppm

So >

2 drops of solution, in 1litre of wine gives 0.1ppm

20 drops of solution in 10 litres of wine gives 0.1ppm

100 drops of solution in 50 litres of wine gives 0.1ppm

Or >

taking 100mL glass and adding 1 drop gives 0.5ppm max allowed level.

Sounds right to me,

I have a small barrel with 50litres of wine and a lingering feint rotten egg smell, after it had been splash racked twice and left for a couple of weeks.

I read that the addition of copper sulphate up to a maximum of 0.5ppm or 0.5mg/litre can be used to remove hydrogen sulphide smells.

I thought I would do some tests at a dosing level of 0.1ppm and work my way up to 0.5ppm dose to see what worked.

I ordered CuSO4.5H2O copper sulphate crystals. Then I realized my kitchen scales will not weigh anything less than 1 gram.

How much CuSO4.5H2O do I need to dissolve in water to produce a solution that can be dropped into my wine at a sensible rate.

My dropper is 0.05mL or 20 drops to a 1mL

If I take 5g of CuSO4.5H2O (teaspoon) and mix with 500ml of water gives 10g/litre or 10000ppm solution of CuSO4.5H2O and water.

Am I correct in thinking???? > adding 0.1mL, 2drops of 10000ppm solution to 1 litre of wine is equivalent to dosing at 1ppm??? or is it 0.1ppm

Thanks in advance

Edit

Thinking about this overnight. I think ive worked it out.

1gram dissolved in 1litre gives me a solution of 1000ppm approx.

1mL (20 drops) of this solution dissolved in 1 litre of wine gives 1ppm which is too high maybe even toxic.

1mL of solution dissolved in 10litres of wine gives 0.1ppm

1mL of solution dissolved in 50 litres of wine gives 0.02ppm

So >

2 drops of solution, in 1litre of wine gives 0.1ppm

20 drops of solution in 10 litres of wine gives 0.1ppm

100 drops of solution in 50 litres of wine gives 0.1ppm

Or >

taking 100mL glass and adding 1 drop gives 0.5ppm max allowed level.

Sounds right to me,

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