Help understanding lead migration

[curiousv]

Hi. Nervous mom again here....was reading about the migration of lead from crystal glasses to juice or wine during a meal. It is estimated that no more than 2 mg per litre of lead is transferred to the glass when drinking out of a crystal vessel during a meal. If this is the case, say a toddler had 2-3 sips out of a crystal glass (thanks to my mother!), how much would she actually have consumed when compared to say, the insanely strict California Prop 65 daily limit for children of 0.5 ug/day?

[studiot]

33 minutes ago, curiousv said:

Hi. Nervous mom again here....was reading about the migration of lead from crystal glasses to juice or wine during a meal. It is estimated that no more than 2 mg per litre of lead is transferred to the glass when drinking out of a crystal vessel during a meal. If this is the case, say a toddler had 2-3 sips out of a crystal glass (thanks to my mother!), how much would she actually have consumed when compared to say, the insanely strict California Prop 65 daily limit for children of 0.5 ug/day?

Impossible to provide a number.

But you should take heart because it can take at least an hour, probably several before appreciable amounts of lead appear in the drink and this is per litre ot per glass.

So divide you figure by the number of glasses per litre, divide it again by the number of sips per glass and divide it again by a factor of 2 or 3 depending how long grandma held the glass before little one tried her couple of sips.

So I doubt any harm was done in this case but just make sure lead crystal glasses are not used again for anybody.

 

North Carolina State University carried out a study of how much get into a glass and how long it takes.

Angela M. Fraser, Ph.D., Associate Professor/Food Safety Specialist, and Carolyn J. Lackey, Ph.D., R.D., L.D.N., Professor/Food and Nutrition Specialist, North Carolina State University (2004)

[chenbeier]

The question is how much is 1 sip.

2 mg/l = 2 μg/ml = 0,5 μg/0,25ml

So it is less then 1 tea spoon of liquid.

Edited December 27, 2020 by chenbeier

[curiousv]

So perhaps 0.5 ug per teaspoon? Or the daily limit recommended. Just trying to put it into perspective as I do tend to over worry. 
One teaspoon is 5 ml though, no???

Edited December 27, 2020 by curiousv

[studiot]

2 hours ago, chenbeier said:

The question is how much is 1 sip.

2 mg/l = 2 μg/ml = 0,5 μg/0,25ml

So it is less then 1 tea spoon of liquid.

A good way to measure it.

But remember that would be after the wine has stood in the glass for a couple of hours.

 

1 hour ago, curiousv said:

So perhaps 0.5 ug per teaspoon? Or the daily limit recommended. Just trying to put it into perspective as I do tend to over worry. 
One teaspoon is 5 ml though, no???

 

As chenbier noted how many sips per teaspoon ?

And how long was the wine in the glass ?

Edited December 27, 2020 by studiot

[curiousv]

7 minutes ago, studiot said:

A good way to measure it.

But remember that would be after the wine has stood in the glass for a couple of hours.

 

 

As chenbier noted how many sips per teaspoon ?

And how long was the wine in the glass ?

It was actually pineapple juice lol. We wouldn’t let the toddler drink wine. It was in the glass maybe 10-15 minutes maximum and she had two sips from the glass. Paranoid? Maybe. But I’d like to get an idea of how much lead that might mean for a 2 year old. For my own info if anything. 

[studiot]

Actually it's alkali that attacks glass, not acid and lead salts of most acids are not very soluble at the best of times.

And 15 minutes.

But hopefully like burning one's fingers once, one hopes to learn not to take chances again.

 

Also the stuff will accumulate more in the dregs, and I doubt the child sipped those, but the good professor from Carolina probably analysed the whole contents of the glass, dregs and all.

Edited December 27, 2020 by studiot

[curiousv]

I’m sorry I am still having a hard time understanding how much lead we would be looking at in one teaspoon??? It seems it would be approximately 10 ug in one teaspoon? So if it was two sips, say two teaspoons, it would be 20 ug? That seems like an insanely high amount of lead?? Is that not equal to 2000 ppb???? And the recommended amount of lead in water is 1ppb or less??? Omg?  😭

Edited December 28, 2020 by curiousv

[John Cuthber]

22 hours ago, curiousv said:

the insanely strict California Prop 65 daily limit for children of 0.5 ug/day?

If you did this once a year then you could "safely"  multiply by 365.

 

It's a non problem.

Drinking water the rest of the year will make more difference to the total dose.

[curiousv]

Thank you everyone for your input. Greatly appreciated.