But it also illustrates just how intractable the issue of nitrate pollution has become.
They also spoke about fertiliser and compared its ammonium nitrate content with sports injury cold packs.
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Aerobic bacteria chew up the ammonia and turn it first into nitride and then to nitrate.
The Safe Explosives Act only requires that ammonium nitrate manufacturers submit samples upon request.
The presence of nitrate in the water is predominantly a consequence of land management decisions and farming practice.
Forensic reports suggested substances used in the explosion had included RDX, ammonium nitrate and petroleum hydrocarbon, he added.
Then anaerobic bacteria take that nitrate and turn it into harmless nitrogen gas.
Hoping to revive the nitrate industry, the Chilean government established SQM in 1968.
Current molten salt mixes are typically 60% sodium nitrate and 40% potassium nitrate.
Ammonium nitrate, a solid fertilizer composed of ammonia and nitrogen, is also a component of explosives widely used in mining.
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The blast ignited a fire on a second ship docked in Galveston Bay that was also loaded with ammonium nitrate.
Reports in the media say that ammonium nitrate was used in the small bombs which had been placed in confectionery boxes.
The three reels were found among some unidentified American nitrate prints, which were left at the New Zealand Film Archive in 1989.
One is an immediate effect as surface run-off takes roughly 50% of the free nitrate straight into Thames tributaries and the main river.
They will measure the amount of carbon, phosphate and nitrate in the soil, together with the rate of plant growth and microbial decomposition.
The state fire marshal's office had previously ruled out four potential causes: weather, natural causes, anhydrous ammonium and ammonium nitrate in a rail car.
The situation remains volatile because of an extremely dangerous substance, ammonium nitrate, found at the scene, said an official from the county sheriff's office.
In the dry uplands of Chile, rich mineral nitrate deposits were then found, and gradually took the place of guano in the late 19th century.
It was Garcia who made the initial visit to Access in Hanwell to ascertain whether he could hire a unit to store the ammonium nitrate.
The area around the site of remains "very volatile" because of the presence of ammonium nitrate, according to Matt Cawthon, chief deputy sheriff of McLennan County.
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On Monday, the state fire marshal's office said it ruled out four potential causes: weather, natural causes, anhydrous ammonium, and ammonium nitrate in a rail car.
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Clearly visible in the new time series are major land-use changes during the 20th Century that gave enormous nitrate kicks to the hydrology of the Thames basin.
On Monday, the state fire marshal's office said it had ruled out weather, other natural causes, anhydrous ammonium and ammonium nitrate in a rail car as possible causes.
"Anhydrous ammonia will burn but it is unusual for it to detonate, whereas ammonium nitrate has a track record of blowing up, " he told the BBC World Service.
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The record is not simply a picture of nitrate concentrations.
Nitrate-rich run-off, for example, can wreck the ecology of lakes.
The nitrate mines fuelled Chile's economy and fertilised Europe's farms.
It is clear also from an analysis of the various inputs and outputs over the period that a lot of nitrate accumulated in the catchment has yet to come out.
An expert on fertilisers at the University of London, Prof Andrea Sella, told the BBC it was possible that the highly explosive ammonium nitrate had also been stored on site.
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Levels of key nutrients, such as phosphate and nitrate, are highest in the Midlands, East and South of the country where population density is highest and farming methods the most intense.
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