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EU Regulations Address Heavy Metals In Consumer Products

By Christopher Dacus
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RoHS 3 (EU Directive 2015/863) adds a catch-all “Category 11” of regulated products that includes electronic nicotine delivery systems (ENDS), e-cigarettes, cannabis vaporizers and vape pens. This category becomes effective July 22, 2019. The most significant restricted substance applicable to this category is lead, and RoHS requires regulated products to contain less than 1000 parts per million (ppm). This follows on the heels of California’s new 2019 regulations requiring the testing of contents of cannabis vape cartridges using even stricter limits for lead (which makes sense because it applies to the product being consumed, not the separate electronic components). These regulations may seem unrelated, but anecdotally there have been widespread reports of higher than expected lead content in China-sourced electronic components, including both cartridges and related electronics. Whether metal used in e-cigarette type products is the source of any lead in the actual nicotine, cannabis or other concentrated product is an entirely different topic, but new laws, and in particular the new RoHS catch-all category, make 2019 an important year for any company responsible for certifying or testing lead levels in e-cigarette or vape products.

Background on EU RoHS

RoHS (Restriction of Hazardous Substances) originated in the EU in 2003 as a restriction on hazardous substances in specified categories of electronics and electronic products. Other countries have passed laws styled after RoHS, but only the EU RoHS is addressed here. Unlike some environmental laws, RoHS is not only focused on the safety of products during their life cycle of consumer use, but is designed to keep restricted substances out of landfills and recycling centers.

The original RoHS restricted the use of lead, cadmium, mercury, hexavalent chromium, PBB and PBDE. RoHS now restricts the use of a total of ten substances after the EU added four types of phthalates to its restricted substance list. Compliance with RoHS became a requirement for the use of the CE mark in 2011, and replaced a RoHS compliant mark on restricted products.

RoHS specified categories for regulation include large household appliances, small household appliances, computer equipment, lighting, power tools, toys, certain medical devices, control equipment (smoke alarms, thermostats and their industrial equivalents), and ATM machines. Newly added Category 11, the “catch all” category, includes all other electronic and electrical equipment not covered in the previous categories, including electronic nicotine delivery systems, cannabis vaporizers and vape pens.

RoHS Lead Exemptions Complicate Compliance

RoHS provides numerous exceptions to its strict 1000ppm lead standard that are slated to expire in phases from 2021 through 2024. Most Category 11 exceptions will not expire until 2024. For example, RoHS permits different levels of lead for lead in glass and ceramics, lead in high temperature solders, and lead in copper and aluminum alloys. So, an e-cigarette may contain some parts that are held to the highest level of lead restriction, it may but contain isolated components that (at least through 2024) are held to more permissive standards. While this leeway may reduce manufacturing costs for certain components, it creates greater complexity in testing. Anecdotal reports suggest that especially for products that compete heavily on price, sourcing from lesser-known Chinese foundries has resulted in unpredictable lead levels.

Take Away Points

As vape and e-cigarette companies compete with new features and design elements each year, and companies rely on new manufacturers, keeping up with regulations has proven to be difficult for both U.S. and for EU regulated products. For example, a company has to comply with numerous regulations regarding the oil or concentrate that will ultimately be inhaled by a consumer, and with regulations like RoHS that regulate parts a consumer may never touch or see. Each year, some company comes out with a new set of electronic features that may interact with newly formulated oils or concentrates, other companies compete for features or price points, making these products a moving target when it comes to testing.

Adding lead to many metals makes them easier to work with and therefore cheaper. Anecdotal reports suggest that especially for products that compete heavily on price, sourcing from lesser-known Chinese foundries has resulted in unpredictable lead levels. This can be the result of any number of causes: changes in sub-contractors, uses of industrial equipment for other products that permit higher lead content, or simply unscrupulous management that is willing to risk a contract to save money manufacturing a batch of components. There is speculation that some lead may leach into oil or concentrates in e-cigarette and vape products from the contact between the oil or concentrate and internal heating elements in certain type of products. RoHS compliance with regard to lead levels may reduce the chance of inadvertent lead contamination by such means, and compliance may therefore yield benefits on several regulatory fronts.

Compliance with RoHS for each part of an e-cigarette or vape therefore requires knowing your supplier for each component, but given increased regulation of these products (both the hardware and consumable elements) this can only help compliance with regulations in every relevant jurisdiction.

Heavy Metals Testing: Methods, Strategies & Sampling

By Charles Deibel
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Editor’s Note: The following is based on research and studies performed in their Santa Cruz Lab, with contributions from Mikhail Gadomski, Lab Manager, Ryan Maus Technical Services Analyst, Laurie Post, Director of Food Safety & Compliance, and Charles Deibel, President Deibel Cannabis Labs.

Heavy metals are common environmental contaminants resulting from human industrial activities such as mining operations, industrial waste, automotive emissions, coal fired power plants and farm/house hold water run-off. They affect the water and soil, and become concentrated in plants, animals, pesticides and the sediments used to make fertilizers. They can also be present in low quality glass or plastic packaging materials that can leach into the final cannabis product upon contact. The inputs used by cultivators that can be contaminated with heavy metals include fertilizers, growing media, air, water and even the clone/plant itself.

The four heavy metals tested in the cannabis industry are lead, arsenic, mercury and cadmium. The California Bureau of Cannabis Control (BCC) mandates heavy metals testing for all three categories of cannabis products (inhalable cannabis, inhalable cannabis products and other cannabis and cannabis products) starting December 31, 2018. On an ongoing basis, we recommend cultivators test for the regulated heavy metals in R&D samples any time there are changes in a growing process including changes to growing media, cannabis strains, a water system or source, packaging materials and fertilizers or pesticides. Cultivators should test the soil, nutrient medium, water and any new clones or plants for heavy metals. Pre-qualifying a new packaging material supplier or a water source prior to use is a proactive approach that could bypass issues with finished product.

Testing Strategies

The best approach to heavy metal detection is the use of an instrument called an Inductively Coupled Plasma Mass Spectrometry (ICP-MS). There are many other instruments that can test for heavy metals, but in order to achieve the very low detection limits imposed by most states including California, the detector must be the ICP-MS. Prior to detection using ICP-MS, cannabis and cannabis related products go through a sample preparation stage consisting of some form of digestion to completely break down the complex matrix and extract the heavy metals for analysis. This two-step process is relatively fast and can be done in a single day, however, the instruments used to perform the digestion are usually the limiting step as the digesters run in a batch of 8-16 samples over a 2-hour period.

Only trace amounts of heavy metals are allowed by California’s BCC in cannabis and cannabis products. A highly sensitive detection system finds these trace amounts and also allows troubleshooting when a product is found to be out of specification.

For example, during the course of testing, we have seen lead levels exceed the BCC’s allowable limit of 0.5 ppm in resin from plastic vape cartridges. An investigation determined that the plastic used to make the vape cartridge was the source of the excessive lead levels. Even if a concentrate passes the limits at the time of sampling, the concern is that over time, the lead leached from the plastic into the resin, increasing the concentration of heavy metals to unsafe levels.

Getting a Representative Sample

The ability to detect trace levels of heavy metals is based on the sample size and how well the sample represents the entire batch. The current California recommended amount of sample is 1 gram of product per batch.  Batch sizes can vary but cannot be larger than 50 pounds of flower. There is no upper limit to the batch sizes for other inhalable cannabis products (Category II).

It is entirely likely that two different 1 gram samples of flower can have two different results for heavy metals because of how small a sample is collected compared to an entire batch. In addition, has the entire plant evenly collected and concentrated the heavy metals into every square inch of it’s leaves? No, probably not. In fact, preliminary research in leafy greens shows that heavy metals are not evenly distributed in a plant. Results from soil testing can also be inconsistent due to clumping or granularity. Heavy metals are not equally distributed within a lot of soil and the one small sample that is taken may not represent the entire batch. That is why it is imperative to take a “random” sample by collecting several smaller samples from different areas of the entire batch, combining them, and taking a 1 g sample from this composite for analysis.

References

California Cannabis CPA. 12/18/2018.  “What to Know About California’s Cannabis Testing Requirements”. https://www.californiacannabiscpa.com/blog/what-to-know-about-californias-cannabis-testing-requirements. Accessed January 10, 2019.

Citterio, S., A. Santagostino, P. Fumagalli, N. Prato, P. Ranalli and S. Sgorbati. 2003.  Heavy metal tolerance and accumulation of Cd, Cr and Ni by Cannabis sativa L.. Plant and Soil 256: 243–252.

Handwerk, B. 2015.  “Modern Marijuana Is Often Laced With Heavy Metals and Fungus.” Smithsonian.com. https://www.smithsonianmag.com/science-nature/modern-marijuana-more-potent-often-laced-heavy-metals-and-fungus-180954696/

Linger, P.  J. Mussig, H. Fischer, J. Kobert. 2002.  Industrial hemp (Cannabis sativa L.) growing on heavy metal contaminated soil: fibre quality and phytoremediation potential. Ind. Crops Prod. 11, 73–84.

McPartland, J. and K. J McKernan. 2017.  “Contaminants of Concern in Cannabis: Microbes, Heavy Metals and Pesticides”.  In: S. Chandra et al. (Eds.) Cannabis sativa L. – Botany and Biotechnology.  Springer International Publishing AG. P. 466-467.  https://www.researchgate.net/publication/318020615_Contaminants_of_Concern_in_Cannabis_Microbes_Heavy_Metals_and_Pesticides.  Accessed January 10, 2019.

Sidhu, G.P.S.  2016.  Heavy metal toxicity in soils: sources, remediation technologies and challenges.   Adv Plants AgricRes. 5(1):445‒446.