Lyla Lindsey
Atrazine is a herbicide used to control weeds in summer crops in Australia. It is also used in the US and was previously used in the EU until it was banned in 2003. Atrazine is a common contaminant in Australian waterways, and its use has been linked to disruptions in male fertility. While the Australian Pesticides and Veterinary Medicines Authority (APVMA) has found that atrazine does not pose a risk to human health, there are concerns about its impact on the environment, particularly water supplies. There have been calls for Australia to follow the EU's lead and ban the herbicide, but it is still currently in use.
| Characteristics | Values |
|---|---|
| Banned in Australia | No |
| Banned in the European Union | Yes |
| Banned in the United States | No |
| Use in Australia | Used to control weeds in summer crops like sorghum, maize, sugarcane, pasture, golf courses, and canola |
| Use in the United States | Used in crops like the ones in Australia, as well as pine and eucalypt plantations |
| Effects | May cause disruptions to metabolism, decreased sperm motility, weight gain, cardiovascular problems, and reproductive issues |
| Australian Drinking Water Guideline | 20µg/L |
| European Drinking Water Guideline | 0.1µg/L |
| US Drinking Water Guideline | 3µg/L |
| Australian Government-Approved Safe Level | 0.5 milligrams of atrazine per kilogram of body weight per day |
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What You'll Learn
- Atrazine is a herbicide that is widely used in Australian agriculture
- Atrazine is not banned in Australia, but restrictions on its use have been introduced
- Atrazine has been found in Australian water supplies, including in Queensland
- Atrazine has been linked to adverse effects on male fertility in mice
- The Australian government has set a maximum level for Atrazine in drinking water
Atrazine is a herbicide that is widely used in Australian agriculture
Despite its widespread use, atrazine has been the subject of controversy due to its potential impact on the environment and human health. In 2002, the Australian Pesticides and Veterinary Medicines Authority (APVMA) released an interim review report on atrazine, which led to restrictions on its use to minimise environmental risks. These restrictions included buffer zones around waterways and limits on application rates. Regulatory actions in 1997 resulted in the cancellation of industrial, home garden, commercial turf, and non-agricultural uses of atrazine.
The APVMA's 2004 report concluded that atrazine was unlikely to adversely affect amphibians at existing exposure levels. However, it acknowledged that atrazine in non-agricultural settings could endanger the environment and proposed amending product labels to include larger buffer zones and additional precautionary statements. These changes were implemented by 2010 to ensure atrazine products continued to meet safety, efficacy, and trade criteria.
Despite these measures, atrazine has been detected in Australian water supplies, with almost every sample of water taken from Dumbleton Weir on the Pioneer River between 2011 and 2023 containing the herbicide. The average detection level was 0.5µg/L, below the Australian Drinking Water Guideline of 20µg/L but five times higher than the European Guideline. Atrazine has been linked to hormonal changes in amphibians at 0.1µg/L and is banned in Europe due to its recognised health risks. Australian scientists have called for a similar ban, citing concerns about its effects on male fertility. Research from the University of Melbourne has supported these concerns, demonstrating significant impacts on the reproductive and general health of male mice exposed to atrazine.
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Atrazine is not banned in Australia, but restrictions on its use have been introduced
Atrazine is a herbicide used in Australian agriculture to control weeds in crops such as sorghum, maize, sugarcane, and canola. It is also used on golf courses and in pine and eucalypt plantations. Australia has been criticised for its continued use of certain chemicals that are banned in other countries due to their toxic effects on humans, animals, or the environment. Atrazine is one such chemical that has been banned in the European Union since 2003 due to its damaging effects on male fertility.
Despite atrazine being banned in the EU, it is not banned in Australia. However, there have been calls from scientists for this to change due to the herbicide's impact on male fertility. A 2024 study by the University of Melbourne found that atrazine exposure during puberty significantly affected the reproductive and general health of male mice, including increased dead spermatozoa and decreased sperm motility.
In response to detections of atrazine in water bodies and to minimise potential risks to the environment, restrictions on the use of atrazine in Australia have been introduced. These restrictions include buffer zones around waterways or water sources, removal of uses in channels or drains, and limits on application rates. For example, there is a maximum annual rate of application of 3 kilograms of active ingredient per hectare in all crops except plantation forestry.
The Australian Pesticides and Veterinary Medicines Authority (APVMA) has also varied the label instructions for atrazine products to reduce the risk of the chemical entering waterways and to update information on withholding periods and weed resistance reporting. The APVMA maintains that atrazine does not pose a risk to human health, but that its use in non-agricultural situations might endanger the environment.
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Atrazine has been found in Australian water supplies, including in Queensland
Atrazine has been detected in Australian water supplies, including in Queensland. In Queensland, Atrazine was detected at up to 0.0013 mg/L (1.3 µg/L) in surface waters. Queensland Health established a limit of reporting of 0.1 µg/L for Atrazine in 2007. The acceptable daily intake (ADI) for Atrazine is 0.005 mg per kg of body weight, based on a no-observed-effect level (NOEL) of 0.5 mg/kg bw/day from a 2-year dietary rat study.
The presence of Atrazine in Queensland's water supplies has sparked concerns among residents and local authorities. The Burdekin Shire Council, for instance, acknowledged the presence of traces of Atrazine in its town water supply, but assured that the levels were well below the safe drinking guidelines. The Australian Centre for Tropical Freshwater Research (ACTFR) has also raised concerns, stating that Atrazine has been found in large quantities in North Queensland rivers, posing a potential public health risk due to its pollution of town water supplies.
The detection of Atrazine in Queensland's water supplies is not an isolated incident. Regional council data revealed over 1000 pesticide detections, with a maximum detection average of 0.98 µg/L. When examining the reticulated water samples in isolation, there were still 204 positive detections in reticulated water supplies, with a maximum detection average level of 3.9 µg/L.
The issue of Atrazine in Queensland's water supplies is complex. While the herbicide is used by cane farmers to control weeds, it is also a known carcinogen, raising concerns about its potential impact on human health. Local governments are taking measures to address the situation, with the Burdekin Mayor, Lyn McLaughlin, emphasizing the importance of providing a safe water supply and assuring that the town water supply is tested at least once a year.
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Atrazine has been linked to adverse effects on male fertility in mice
Atrazine is a herbicide that is widely used in Australia and the USA, but has been banned in the EU since 2003. It is a common contaminant in the waterways of Australia, with around 3,000 tonnes applied to soils every year. Atrazine is mainly used to control weeds in summer crops, such as sorghum, maize, sugarcane, canola, and pasture.
A recent study by the University of Melbourne has found that atrazine exposure has damaging effects on male mice and their sperm. The study, led by Professor Andrew Pask and Dr Mark Green from the School of BioSciences, looked at the effects of 'safe' and high atrazine exposure in mice. The results showed a significant increase in the percentage of dead spermatozoa (sperm) by eight weeks, as well as decreased sperm motility. There were also broader health effects, including weight gain in mice exposed to lower doses of atrazine.
The study also found that atrazine exposure interferes with and reduces the production of male hormones (androgens) while increasing the production of estrogen (female hormones). This can lead to the "'demasculinization'" and "feminization" of male gonads, including reduced testicle size, reduced sperm count, and the development of ovaries.
These effects on male fertility are not limited to mice. Other studies have found similar impacts on male fertility in fish, frogs, and rats. Additionally, low fertility, low sperm count, and poor semen quality have been associated with atrazine exposure in humans living in agricultural areas.
With growing evidence of atrazine's harmful environmental and human health effects, there are calls for a ban on this chemical.
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The Australian government has set a maximum level for Atrazine in drinking water
Atrazine is a systemic triazine herbicide that can be used both before and after the emergence of crops to control grass and broad-leaved weeds. It is one of the most widely used herbicides in Australian agriculture. In Australia, atrazine is mainly used to control weeds in summer crops like sorghum, maize, and sugarcane, as well as canola, pasture, and golf courses.
Despite being banned in the European Union since 2003 due to its damaging effects on male mice and their sperm, atrazine is not banned in Australia. In 2008, the Australian Pesticides and Veterinary Medicines Authority (APVMA) varied the label instructions for the use of atrazine products to reduce the risk of atrazine entering waterways. These changes included updating the information on withholding periods and additional information on weed resistance reporting. The APVMA concluded that atrazine does not pose a risk to human health, but that its use in non-agricultural situations might endanger the environment.
The Australian government has set a maximum level of 20 µg/L for atrazine in drinking water. This is significantly higher than the European guideline of 0.1 µg/L and the US guideline of 3 µg/L. The Australian Drinking Water Guideline for atrazine was previously set at 40 µg/L in 2011 but was lowered to the current level. Despite this, studies have shown that almost every sample of water taken from Dumbleton Weir on the Pioneer River in Queensland between 2011 and 2023 tested positive for atrazine, with average levels of around 0.5 µg/L.
The University of Melbourne conducted a study that focused on the effects of atrazine on male mice. The study examined two doses of atrazine, including the 'safe' level for drinking water determined by the Australian government. The results showed significant negative effects on the reproductive and general health of male mice, including increased dead spermatozoa and decreased sperm motility. The study highlights the need to investigate the chronic effects of low doses of endocrine disruptors, which are used to calculate the government-approved safe level.
While atrazine remains legal in Australia, there have been calls from scientists to withdraw its use due to its potential impact on male fertility. The Australian government's approved safe level for atrazine in drinking water may need to be reassessed in light of new research and evidence of its effects on reproductive health.
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Frequently asked questions
No, atrazine is not banned in Australia. It is one of the most widely used herbicides in Australian agriculture.
Atrazine is a herbicide used to control grass and broadleaved weeds in crops such as sorghum, maize, sugarcane, lupins, and triazine-tolerant (TT) canola, as well as in pine and eucalypt plantations.
There are concerns about the potential adverse effects of atrazine on human and animal health, as well as the environment. Atrazine has been linked to issues with hormones, decreased sperm counts, increased rates of testicular cancer, and malformations in male genitalia. It has also been detected in water supplies, with almost every sample of water taken from Dumbleton Weir on the Pioneer River between 2011 and 2023 testing positive for atrazine.
Yes, there are restrictions in place to minimise the risk of atrazine entering waterways and to protect the environment. These include buffer zones around waterways or water sources, removal of uses in channels or drains, and limits on application rates.
