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1) What's the other 90-99% of the fluid? 2) What material are the seals you're using now comprised of? We're talking an elastomer, right? According to the information I have on pure benzene, Buna-N is classed as "conditionally resistant" and Viton as "resistant." EPDM, EPT, and neoprene are...

I retract what I said. I did a little looking up, and apparently the substrate in hard chromium plating is not invariably nickel plated, as it must be in decorative nickel plating. Also, some degree of micro porosity is often considered desirable, for lubricant retention. Though, if I were...

"A pH of 8-9 is not a high pH. The 5% wt caustic is in the chemical feed line, not in the vessel itself. The temperature is not that high either. Don't see where you inspections department came up with this Caustic Crackin / Corrosion arguement." I don't either. I've seen equipment made of...

If it is a good hard chrome job, I doubt that there are any pits or cracks that would penetrate all the way down to the substrate. Is the aqueous phase very acidic? Acidic media with high levels of chlorides are truly, the Olympics of corrosion resistance. I've looked into this, a little, and...

Hmmm. When you said "organic acids" I was thinking you meant fatty acids, like stearic, palmitic, etc. The calcium salts of acetic, formic, and propionic acids are soluble in water. So, perhaps a lime slurry is a good choice for you. But, you need to have very good agitation in the reaction...

"Would you elaborate on the "cracking issues"?" Thanks. I had figured it was some metallurgical issue beyond my understanding. Perhaps, there are some kinds of stainless steel, in which intergranular corrosion will be promoted by sodium hydroxide. But, I don't know of any, and caustic soda is...

Some years ago, I worked on a mobile unit for hazardous waste treatment. All the surfaces that we had to walk on were fabricated of this wonderful green fiberglass grating. It was fashioned such that the edges of the grate material that faced upwards were concave, and were...sharp, if that makes...

Either lime or magnesium hydroxide will generate voluminous "lime soap" sludge. MgO will not raise the pH high enough to convert the ammonium salts into ammonia to any great extent. I second the suggestion to consider sodium carbonate if caustic is unacceptable. There are also zeolites that...

Like so many things, it depends. Old time lead paint, using basic lead carbonate as a base, contains lead at percent levels. In my paint analysis days, I'd often see samples that contained lead at lower levels, either from contamination with older layers of paint, or the use of lead bearing...

It is not entirely clear to me what you mean. You allude to a "heavy hydrocarbon stream". Do you mean organic chlorides in it, such as perchloroethylene? In that case, you should be fine. If you mean water with dissolved chloride ions, that is something else again. Dave Wichern...

A search of this site: http://www.quadna.com/index.php using the terms "quadna screen" yielded zip. It may be a trivial name for some piece of equipment manufactured by somebody they rep for. If you contact them, doubtless thyey can help you. Dave Wichern http://www.dedalusenviro.com Science...

As per Ken's caveat, I am cutting way back on my Clorox chugging habits, as well as hanging a braid of garlic cloves in my bedroom. Seriously, a lot of what one thinks about this depends on what one has seen. In the context of hazardous waste landfill leachates, I have seen studies that...

http://www.isco.com/products/products2.asp?PL=20110 I've seen these in service in various applications. The San Jose/Santa Clara WPCP uses them to monitor their Industrial users. Dave Wichern http://www.dedalusenviro.com Science is a business of empiricism.

If benzene is all that is present, I could see that working. I don't know the chemistry behind the particular Draeger tube you're using. I imagine that it is some kind of generalized oxidative reaction, such as dichromate or permanganate oxidation. These reactions go much faster with compounds...

Electroless copper plating, or some kind of vapor deposition process. Dave Wichern http://www.dedalusenviro.com Science is a business of empiricism.

I believe that what you're trying to do requires the use of gas chromatography. Portable instruments are available. The kind of equipment you mention is entirely nonspecific; and cannot be made specific without some means of separating the various compounds. Like, GC. Dave Wichern...

I'll echo some suggestions that have already been made. Ken mentioned electrocoagulation; I have seen this work very effectively on emulsified oily waste from a steam cleaner. Far superior to conventional chemical treatments. Nalco: it's hard to beat them. They (literally) wrote the book. When...

The problem Ken mentions can be avoided by using a two column system, with the cationic resin first. H+ goes in as Na+ comes out, and the pH goes down before the water hits the anionic resin column. Most systems on the market now are single column, mixed bed systems, they're more efficient. But...

Ken mentions a very important point that I missed - using DI water for make up of the bath. He also proposes an excellent, but very capital intensive solution to your problem. It is probably the best way to go, if you want an "idiot proof" set up. Ion exchange has an important advantage: the...

Gary gives an excellent tip. Iminodiacetic resins of the kind he alludes to have an intense affinity for Hg. Rohm and Haas makes one called Amberlite IRC 718 that will also work. If you prefer a more conventional precipitation process, there is an organo-sulfur product called TMT that is...