Food

Are Copper Mugs Poisoning You?

What you need to know about the safety of copper cookware and drink ware

Copper, the pinkish-orange brassy metal that coats our pennies can also be found in the kitchen! We often see copper in those fancy mugs known for serving Moscow mules, but it is also found in other kitchenware like pots and pans. You may have seen some articles or blog posts warning about the dangers of kitchenware made of copper, or other voices claiming this fear is unnecessary and that these dishes and mugs are completely safe. Or, maybe you've never thought twice about it. Well…what's the deal?! Here we will clear up this mystery so you can feel comfortable and safe sipping on your refreshing Moscow Mule.

Copper Exposure and Health

Copper is a naturally occurring metal used industrially for electrical wiring, pipes, and other metal products and used agriculturally and in healthcare as an antimicrobial agent or contraceptive. Copper is an essential element, meaning that humans require some level of copper in our bodies(1). However, at high levels, (above 1,300 parts per billion), ingesting copper can irritate your digestive system and cause nausea, vomiting, stomach cramps, and diarrhea (2).

So, how are humans exposed to this metal? Like other metals, copper, when in contact with a liquid has the potential to leach off and become dissolved in the liquid. When consuming the liquid, any leached copper will be ingested and could cause the unfortunate digestive irritation mentioned above. The rate of this dissolution reaction depends on the properties of the metal, the properties of the liquid, and the temperature of these substances.

Copper in the kitchen is most commonly found in the form of mugs, or cookware like pots and pans. Copper kitchenware is sold either lined, meaning the inside is coated with a different, less corrosive metal, or unlined, where the item entirely copper. Going back to our fun chemistry lesson above, the potential to ingest copper at home (or at the bar!) comes from the possibility of the copper leaching into whatever substance you are cooking or drinking. So, the big question: Will the copper in your kitchen products leach and cause toxicity? In short, probably not.

Mugs – Although copper does leach faster than most metals used in cups, it would take many, many hours of sitting in the mug before your Moscow Mule became dangerous to drink (3). Of course, Moscow mules are not the only drink served in copper mugs, and other substances can behave a little differently. Most beverages are OK, but acidity and heat speed up the dissolution reaction (4). Something as acidic as lime juice would still take a few hours to leach, but to err on the side of caution, leaving hot and/or acidic substances in unlined copper dish ware should be avoided (3).

Pots and Pans – Because of the high temperatures used when cooking, unlined copper cookware should not be used (4)! The good news—nearly all copper cookware on the market is lined with a different metal. However, you can never be too careful! When cooking with copper items, make sure the inside is a different color, or that the label specifies "lined" to be certain that it is safe to use.

Pipes – The most common way humans are exposed to ingested copper is through tap water when copper faucets or storage pipes are used. If you are concerned about your water at home, run the water 15-30 seconds prior to drinking (2).

Our Advice

Don't fret about enjoying a drink out of a copper mug! If you are investing in new copper mugs, we recommend purchasing stainless steel-lined ones, but regardless there is no need to panic. If you have unlined mugs, just take care to ensure super hot or acidic substances don't sit in them for extended periods of time, and be extra cautious around children. As for pots and pans, invest in lined copper only. If you're on the market for some new copper kitchenware, here are some lined options pots, pans, and mugs. Now enough anxiety about copper, it's time to sit back, relax, and enjoy that Moscow mule!

Sources

1 https://medlineplus.gov/ency/article/002419.htm

2 https://www.atsdr.cdc.gov/ToxProfiles/tp132-c1-b.pdf

3 https://www.huffpost.com/entry/moscow-mule-not-poisonous_n_598c7552e4b0a66b8bb1938d?guccounter=1

4 https://accelconf.web.cern.ch/accelconf/p01/PAPERS/TPAH106.PDF

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No matter where you live, sustainability is becoming a hot topic. It might be a friendly reminder sign to bring your reusable bag to the grocery store, a city government conversation about not using straws, or it could run as deep as cities committing to be zero waste - some as early as next year. With all of this comes the question of what sort of products are best for the world? Is biodegradable really any different from compostable. Should I opt for compostable options over recyclable ones? Does reusing things help?

All of these are great questions! And the answer to all of them has an impact on our planet, and oftentimes our health, too.

So, first of all, what do all of these different terms that are being thrown around really mean? Let's start with the one we probably have all heard the most: recyclable.

Recyclable

Recycling is the process of taking a product and breaking it down to use it again, often as a raw material. We all know that we can recycle paper, plastic, and cans. In most places, recycling facilities can also deal with glass. All of this is great, but let's break down the concept a little bit more. Quick note, each city is slightly different and you should check exactly what can and can't be recycled in your neighborhood before you just assume you are good to go.

Tossing something you think or hope can be recycled into the recycling bin is often called wishful or aspirational recycling. While your heart is in the right place, doing this might actually be worse than just trashing something you aren't clear on. Why? Because that one iffy thing can actually be enough to compromise a full batch of recycling, which could mean everything ends up in the landfill instead of just the one questionable item. In those situations, the best option would be to confirm before you dispose of it. And, if your neighborhood doesn't recycle it, ask your city to start accepting those items. But, in the meantime, if you don't know, don't just hope it can be recycled.

Back to the topic at hand, what is actually recyclable? Most plastics that hold their shape can be recycled (like water bottles, food containers, bottles for household items, etc.). In some places, they have even started being able to accept items like plastic grocery bags, shrink wrap, and plastic wrap if it is packaged correctly. Other commonly accepted items for recycling include paper, cardboard, unbroken glass and metal (including tinfoil if it's clean and in a large enough ball).

Some common items that need special recycling (but are in fact recyclable) include: batteries, electronics, and fabric (and clothing). Check with your waste management provider to see what can and can't be recycled in your neighborhood.

Compostable

This is becoming more common in larger metropolitan cities. Composting is a way to turn items made of natural materials back into a nutrient rich soil. Often times the compost is for food scraps, but other items that are fully compostable include yard scraps, dead flowers, items made of untreated wood, and those made of pure cotton. While starting with food scraps is the easiest, the more you look around the more you will find items for other parts of your life that are completely compostable.

Compostable items are great because instead of going to landfill or needing to be processed and turned into something else, they actually breakdown themselves in a natural setting (or in an industrial facility) to create something useful right away.

But, what happens if you have items that are compostable but don't have access to composting. Side note: you can create a compost pile in your own backyard (or under your sink). We know that isn't for everyone though. So, what happens if these items end up in just in your standard trash bin? You might think that it's still an improvement and they will break down, right? Sorry to be the bearer of bad news, but that's not exactly the case. Compostable items break down into nutrient rich soil only if they have the right conditions. And a traditional landfill is not a place with the right conditions.

Industrial facilities have the optimal conditions for composting. These facilities regulate temperature, moisture, and air flow in order to ensure a compostable item breaks down as fast as possible. At-home compost is more prone to temperature/moisture/air flow changes and might not break down as quickly as it would in an industrial setting.

Composting works best when the items have access to oxygen and are regularly being turned over. A landfill is basically the opposite. It's an anaerobic environment where most of the pile actually doesn't have access to oxygen. That means that if your compostable takeout container ends up in the landfill, it won't break down as intended. Instead, it will mostly likely just act like a plastic container and stay around for a lot longer than intended.

So, while recognizing compostable items is a good first step, purchasing and using compostable items in place of other items has the biggest impact when they actually end up in a compost pile. Although, we do want to mention that the production of plastic is pretty nasty for a lot of reasons, so opting for compostable items made of cotton, bamboo, and even PLA (that vegetable based plastic cup you see at some restaurants now), is probably still better for the environment and your health.

Biodegradable

The dictionary definition of biodegradable is a substance that can break down naturally without causing any harm (1). This is very similar to compostable, but the biggest difference is that what it breaks down to doesn't cause harm as opposed to starting with an organically occurring materials. Therefore, man-made or chemically produced items can still be considered biodegradable, while not necessarily being compostable. This is like a square being a rectangle but a rectangle not being a square. Those items that are compostable are also biodegradable, but not everything biodegradable is compostable.

Again, biodegradable options are still a step in the right direction. It does mean that the ingredients break down over time (that's a perk) and when they do break down, the base components are not harmful to the environment (also a perk).

One drawback of biodegradable materials is that there is not necessarily a timeframe for when the items will break down. It could be many years before they start to degrade. In most cases, biodegradable isn't really saying much about the product. Think of it the same way you do products labeled "natural."

The bottom line

If we were to rank these terms for which ones are best for the planet and in turn our health, we'd say first look for items that are compostable, recyclable, and lastly biodegradable. Compostable items, if properly disposed of, will break down completely and can them be used to grow more resources. Recyclable items can be turned into raw materials that can then be used to make new things without needing to create completely new resources. And finally, biodegradable options will eventually break down, but we don't know when and there is no plan to use them for any additional benefit.

Of course, we are big proponents of reusing items when possible, but we also know that it can be incredibly hard to live your life without there being some items that needs to be disposed of. So, go on with this new information to help you think about what to toss and how to do it best.





References

  1. https://www.merriam-webster.com/dictionary/biodegradable
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