FLUID TECHNOLOGY FROM MILTON ROY
REPORT
NOTES COMPANY
new high pressure hydrogen generator is convenient on-demand source Handling hydrogen in the laboratory, especially at higher pressures, involves many problems . . . safety, convenience, cost, purity. The new Milton Roy Elhygen Hi Ρ solves all these problems. In addition, it provides an on-demand source that eliminates the nuisance of cylinder storage and handling.
Proof of Pollution Responsibility
Elhygen® Hi Ρ electrolytic hydrogen generator $748.00*, including electrolyte One year warranty
The Elhygen Hi Ρ operates on the same basic principle as the popular standard Milton Roy Elhygen. The major differ ence is in delivery pressure, which has been raised to 400 psig in the new model. Flow rates of up to 150 ml/min at standard conditions of pressure and temperature are available from the new unit. The Elhygen Hi Ρ is a compact, bench top unit that lets you generate bone dry, ultrapure hydrogen as you need it. Just add distilled or deionized water and you have an ondemand hydrogen source for chromatography, synthesis, con trolled atmosphere. Only one liter of water gives you 1000 liters of hydrogen. If you need larger volumes for peak de mand, you can use a standard hydrogen cylinder as a drop tank. Filling the container to any preselected pressure up to 400 psig makes ultrapure hydrogen available on demand for short term, high volume flow rates. Order direct, or write for complete information. Ask for bulletin 330. Milton Roy Company, P.O. Box 12169, St. Peters burg, Fla. 33733 other Milton Roy laboratory gas generators
Standard Elhygen > Produces up to 150 ml/min ultrapure hydrogen at STP with pressures adjustable to 60 psig. Price: $548.00 including electrolyte. Elhygen Deuterium Generator
Dissociates chemically pure deute rium oxide to produce up to 150 ml/min deuterium at STP with pres sures adjustable to 60 psig. Price: $998.00 including electrolyte. y
MILTON ROY COMPANY ST. P E T E R S B U R G , FLORIDA Circle No. 72 on Readers' Service Card
32 A
·
ANALYTICAL CHEMISTRY
observed water quality deteriora tion. This proof uses specialized analytical methods. If the pollu tion effect is a fish kill, fish bioassay proves that the concentrations of toxic agents found in the water are enough to kill fish. Most often, offensive odor in drinking water drawn from the polluted stream is the major effect. Threshold odor tests of the recovered pollutants will establish them as the cause {12).
Proof of the origin of pollution is the capstone in assembling an abatement case, after the evidence described above has been gathered. Ideally, each outfall is sampled and analyzed and the responsible plant identified. Sometimes, it is pos sible to establish responsibility only by sampling the river above and below the source. Grab samples are usually adequate for this pur pose. By continuing this type of analysis at intervals downstream, the pollution is traced to the point where its harmful effect has been observed. The same sampling pro tocol is used to show whether any other sources contribute to the ef fect, how far it persists down stream, and how effective subse quent abatement measures are in overcoming the observed pollution. In establishing the relative con tribution of the organic chemical industry to pollution, radiocarbon dating has been used as a tool to measure the proportions of indus trial and municipal wastes in sur face waters (IS). Finally, the chemist must as semble his evidence in a manner convincing to the officials having pollution abatement authority. One effective method is the "wit ness kit." Packaged in this kit is a series of vials containing visible quantities of the major responsible compounds isolated from polluted water at the site of impaired water use (see Figure 5). The kit also contains a parallel series of vials of the same compounds, isolated in the same way from the responsible waste outfall. Laymen do not fail to understand the correlation.
