Sentences with phrase «higher mercury concentrations»

Concern over these mercury «hot spots» was dismissed by Holmstead, but higher mercury concentrations were later confirmed in a study on the U.S. Atlantic Coast.

Higher mercury concentrations in shallower waters could increase the amount of toxin accumulating in food fish, exposing humans to greater risk of mercury poisoning, Lamborg says.

This approach differs greatly from a previously recognized enzymatic pathway, which is only effective at very high mercury concentrations.

The plankton have higher mercury concentration but lower calories, so the fish grow less efficiently.

49 U.S. states have issued fish consumption advisories due to high mercury concentrations in freshwater bodies throughout the country.

Not exact matches

The FDA Monitoring Program data set, which includes only 19 spiny dogfish specimens, puts the average mercury concentration in dogfish over 0.5 parts per million — high enough to result in an advisory for women of reproductive age and children in many states.

In a new study published in the journal Environmental Science and Technology, Assistant Professor of Meteorology Christopher Holmes writes that thunderstorms have 50 percent higher concentrations of mercury than other rain events.

«We detected the frequent presence of hazardous elements, such as bromine, cadmium, mercury and lead, in very high concentrations in some cases,» says Dr. Andrew Turner, co-author of the study, based at the University of Plymouth, UK.

The inset map is a computer model of Asian mercury emissions across the Pacific Ocean at an altitude of 20,000 feet in April 2004, while atmospheric chemist Dan Jaffe was picking up significant mercury readings on Mount Bachelor (the highest concentrations are in red).

Almost half resulted from the smelting of metals — especially zinc, because its ores contain a high concentration of mercury.

Countries ringing the North Atlantic Ocean, where the mercury concentration is among the highest recorded in the study, may be particularly vulnerable.

«According to our measurements, mercury concentrations at Beijing are alarmingly high, especially in the heating period,» geoecologist Stefan Norra says.

The findings, published in the journal Environmental Research, show a relatively high average mercury concentration in umbilical cord blood (8.2 micrograms per litre), with a 24 % of samples exceeding the WHO's provisional tolerable weekly intake equivalent.

With high growth in fish, the mercury is diluted, resulting in lower concentrations in their tissues.

There are two reasons for this: the bottom - dwelling prey have lower mercury concentrations but also are higher in calories, allowing the fish to gain weight more efficiently and grow faster.

So the toxin in the fish must come from elsewhere, perhaps hydrothermal vents, which are likely to have high concentrations of mercury and to host sulfate - reducers, he says.

In waterways, bacteria convert elemental mercury to methylmercury, an organic form that accumulates in food chains, increasing in concentration higher up the chains.

Concentrations of methyl mercury, the most poisonous form of the metal, are now so high in freshwater fish and marine mammals in some parts of the Arctic that they could not be sold legally in Canada, Environment Canada reports.

To lower mercury levels, Dr. Ludwig recommend avoiding fish that tend to have high concentrations, such as swordfish, tuna, and shark.

Specifically, SUPERB homed in on 44 foods known to have high concentrations of toxic compounds: metals, arsenic, lead, and mercury; pesticides chlorpyrifos, permethrin, and endosulfan; persistent organic pollutants dioxin, DDT, dieldrin, and chlordane; and the food processing byproduct acrylamide.

As a result, Inuit women who eat seal and whale meat have far higher concentrations of PCBs and mercury in their breast milk than women who live in the most industrialized areas of the world, and they pass these poisons to their infants, leaving them susceptible to disease.

The average concentration of mercury in the eight products was 1.78 parts per million, more than four times higher than the «safe» level of 0.4 set by the government of Japan.

However, both sediment records of atmospheric deposition of Hg2 + species at high northern latitudes and atmospheric GEM concentrations inferred from Greenland firn air support the conclusion that transfer of anthropogenic inorganic mercury through the atmosphere to terrestrial and marine reservoirs occurs on a large scale.

In this paper, we present results from a natural archive that provides a unique history of gaseous elemental mercury concentrations at middle and high northern latitudes.

Hence, atmospheric GEM concentrations inferred from Greenland firn air and global anthropogenic Hg emissions have exhibited consistently similar trends during the most recent decades (Fig. 2), suggesting that the atmospheric reservoir of mercury at mid - and high - northern latitudes has been driven mainly by anthropogenic emissions during the last decades.

If a batch of coal has an especially high concentration of mercury, by capturing more of the stack vapors with a new pollution control add on, more mercury becomes more concentrated in the fly ash and / or in a scrubber solution.