Daily Archives: April 16, 2015

Saying “humans cause climate change” is like saying “A football player on the field changes a football game.”

A football player on the field is part of the game itself. How could that player not change the game at least in some small way? (A player could fumble the ball to the other side, or recover a fumble and run for a touchdown,  which in one case would be a catastrophic change for the player’s team, or in the latter case for the opponent). The only way a player would not have some impact on the game is if he were dead, but even then it would impose a change favorable to the opponent.

Humans are part of the environment and the global climate system. How can they not affect or change the climate dynamics at least in some way? The only way that humans could not have some impact is if they were all dead, which is what some advocacy groups (and politicians?) apparently want.

Continuing with the narrative that “human-caused climate change” is a problem is a bridge to nowhere, a nonsense claim that contributes nothing towards the practical resolution of environmental pollution problems in the US or anywhere else on the globe.

Coagulation of Methylated Arsenic in Drinking Water

Hu C, Chen Q, Liu H, Qu J. Coagulation of methylated arsenic from drinking water: Influence of methyl substitution. Journal of Hazardous Materials. 2015 Mar 26;293:97-104. doi: 10.1016/j.jhazmat.2015.03.055.

Methylated arsenic can be found in virtually all earth surface environments. So far, however, little information has been collected regarding their removal by coagulation. In this study, the removal of monomethylarsenate (MMA) and dimethylarsenate (DMA) from drinking water by coagulation was investigated from the viewpoint of methyl substitution. Results indicated that FeCl3 was more efficient than AlCl3 and polyaluminum chloride (PACl) in methylated As removal. For the initial arsenic concentration of 200μg/L, an FeCl3 dosage of 0.2mmol Fe/L was sufficient to attain about 95% removal of MMA, while a dosage of 0.6mmol Fe/L achieved about 57% removal of DMA. Arsenic removal efficiency was negatively correlated with the degree of methyl substitution. With the increase in methyl group number, the quantity of negatively charged arsenic species decreased and molecular size increased, leading to the decrease of methylated As removal by coagulation. Adsorption on preformed hydroxide flocs was the major mechanism during coagulation. Both FTIR and XPS results indicated that the AsO group of As might substitute the OH group of Fe/Al hydroxide to form a Fe/AlOAs complex. Furthermore, the use of traditional oxidants and coagulation aids exhibited limited help for improving coagulation removal of DMA.

Click here for paper (fee).