A 2014 laboratory study tested floating porous blocks containing iron oxide as a way to harm Aedes aegypti eggs and larvae. Sunlight was part of the proposed process, not a treatment on its own: the researchers said the catalyst generated hydroxyl radicals under irradiation. The results concern mosquito stages in controlled experiments; they do not show that dengue virus or dengue disease was eradicated, or that the method prevents infections.
How the proposed sunlight-and-iron-oxide method works
The researchers dispersed iron oxide in a floating support made from autoclaved porous brick. When exposed to sunlight, the iron oxide was intended to drive photocatalysis that generates hydroxyl radicals—highly reactive species that can oxidize organic matter. The proposed pathway could affect organic material that supports larval food as well as the mosquito larvae themselves.
As an Amazon Associate I earn from qualifying purchases.
The study identified hematite (α-Fe₂O₃) as the predominant iron phase using Mössbauer spectroscopy and reported evidence for hydroxyl species based on characteristic mass-to-charge values measured by electrospray ionization mass spectrometry. These findings describe the experimental material and proposed chemistry; they do not establish how the blocks would perform in varied outdoor water conditions.
Free tools Windows power users keep installed
One-click scans. No signup required.
The paper, by Geison V. Pereira, Victor A. Freitas, Henrique S. Oliveira, Luiz C. A. Oliveira and Jadson C. Belchior, appeared in RSC Advances in 2014. Read the article record and abstract at the Royal Society of Chemistry.
#1 Best Overall
- The only product with bti, bacteria toxic only to mosquito larvae
- Lasts for 30 days and treats 100 square feet of surface water
- Non-toxic to all other wildlife, pets, fish and humans
- Labeled for organic gardening by the usepa
What happened in the reported experiment
A 2014 Chemistry World report describes beakers containing mosquito larvae and catalytic blocks exposed to irradiation for one week under controlled experimental conditions. It reported these outcomes:
| Irradiation condition | Reported larval outcome | What it establishes |
|---|---|---|
| Sunlight | 20% of larvae survived after one week | An outcome in the described controlled beaker experiment, not a field efficacy result |
| Artificial UV light | 100% of larvae died | An outcome under that experimental irradiation condition, not proof that outdoor sunlight would produce the same result |
The two figures are not a direct measure of disease prevention. The report does not establish that either irradiation condition would produce the same outcome in ponds, containers or other natural water settings.
Rank #2
- Quick acting formula
- EPA registered in all 50 states
- Available in a 30oz size
Why “dengue eradication” overstates what was demonstrated
Dengue is a disease caused by a virus; Aedes aegypti is a mosquito that can transmit it. The reported work focused on eggs, larvae and a photocatalytic process. It did not show eradication of dengue virus, prevention of human infections, or a reduction in dengue cases. In the paper’s framing, “eradication” refers to the intended target of mosquito-vector proliferation, not demonstrated eradication of the disease.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →The available accounts do not report field efficacy, controlled testing across natural water conditions, or evidence that the blocks are a proven public-health intervention. The results therefore cannot support using experimental blocks—or generic iron oxide or building materials—in household water. The tested formulation and its behavior cannot be assumed from those ingredients alone.
Rank #3
- KILLS MOSQUITO LARVAE: TERRO T1210 kills mosquito larvae when added to stagnant water
- EASY TO USE: The dissolvable pouch is easy to use, has no dust, and requires no breaking
- LONG LASTING PROTECTION: Long-lasting larvacide continues working for up to 2 months
- VERSATILE PLACEMEMT: Use in fish ponds, bird baths, gutters, rain barrels, and other areas where standing water is found
- NO LIMITATIONS: The mosquito larvacide can be applied in areas used by people and pets when used as directed
What the historical cost and durability claims mean
In the 2014 report, researcher Jadson Belchior estimated that preparing 800 small blocks would cost less than US$0.30 and claimed that the blocks remained efficient for more than two months. These are historical claims attributed to Belchior, not independently verified current product specifications or confirmation of durability in field use.
The report also described past licensing and industrial scale-up interest, but the available sources do not establish a currently marketed consumer product or current commercial availability.
Quick Recap
Best Value
- THOROUGH MOSQUITO CONTROL: EPA registered product that kills developing mosquitoes including those which may transmit equine encephalitis & heartworm disease to dogs & cats; Limit the spread of West Nile Disease with effective mosquito control using BMC
- CLEAR WATER: Unlike unsightly mosquito dunk tablets that float on water and only treat the surface, MICROBE-LIFT BMC is a liquid solution that quickly disperses and treats the entire water column, from the surface to the bottom
- EPA REGISTERED: MICROBE-LIFT BMC can be applied to areas that contain aquatic life, fish, and plants; It can be applied to areas used by or in contact with humans, animals, horses, livestock, pets, birds, or wildlife
- EASY-TO-APPLY: Add directly to water at a rate of 2.5 mL per 1,000 gallons or 5 mL per 2,000 gallons every other week; Full bottle can treat 2,500 gallons for up to 13 months, or 3,500 gallons for up to 9 months, or 5,000 gallons for up to 6 months
- A BETTER ENVIRONMENT: Use Biological Mosquito Control in your ponds, water gardens, fountains, and other water features to create a more pleasant environment, without impacting the beautiful natural appearance
Rank #4
- Methoprene 1.5%
- Non-Crop Areas: Altosid Pro-G may be applied as directed above to temporary and permanent sites which support mosquito larval development. Examples of such sites include: snow pools, salt and tidal marshes, freshwater swamps and marshes (cattail, red cedar, white maple marshes), woodland pools and meadows, dredging spoil sites, drainage areas, ditches, wastewater treatment facilities, livestock runoff lagoons, retention ponds, harvested timber stacks, swales, storm water
- Active Ingredients: Methoprene 1.5%
Sources
- Pereira et al., “A photocatalytic process for the eradication of dengue through ˙OH generation in the presence of sunlight and iron oxide,” RSC Advances, 2014.
- Chemistry World, report published 11 December 2014.
- Royal Society of Chemistry blog, 11 December 2014.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
