Fast, Accurate pH Measurement
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FerroZine Iron Reagent OUTDOOR Here is a highly accurate pH meter with hermetically sealed solid-state circuitry at an economical price. Easy to read 6" scale; 0 to 14 pH range with low sodium error. Virtually driftfree; repeatability 0.05 pH. No warm-up—turn it on and it is ready for use. Complete with polyethylene protected combination electrode; ten pH 4 and pH 7 Standard Buffer Powder Pillows; clippers, plastic dust cover and instruction manual. Write for complete information today. Model 1975—Battery operated; 6.75 volt battery provides 1,000 hours continuous use. Price $189.00 Model 2075-AC operated; 110 volt, 60 cycle or 220 volt, 50 cycle, 10 watts. Price, 110V, 60Hz $198.00 Price, 220V, 50Hz 198.00 Prices F.O.B. Ames, Iowa. Subject to change without notice.
Write today for complete information on Hach water analyzers.
HACH
Chemical Co.
P. O. Box 907 Ames, Iowa 50010 U.S.A. Phone 5 1 5 / 2 3 2 - 2 5 3 3 And:
HACH CHEMICAL CO. ANNIVERSARY
Hach Europe Namur, B e l g i u m
CIRCLE 643 ON READER SERVICE CARD LABORATORY
GUIDE
Spectrophotometers for Water Analysis You can't find spectrophotometers any easier to use—especially for water and wastewater analysis. The new DR/2 Model 2504 is available in a handy carrying case; Model 2582 is a handsome laboratory instrument. Both offer the advantages of dialing any of various light wavelengths instead of selecting from a set of individual color filters for each colorimetric test. DR/2 instruments utilize a circular variable interference filter with a wavelength range of 400 to 700 nanometers (nm). Special wavelength dial positions are also marked for suspended solids testing (infrared light) and for measurement of color in water. Electronics are all solid-state with transistorized voltage regulation. The carrying case model can be operated on either eight standard flashlight batteries or 115/220 V, 50/60 Hz; the laboratory model operates on either 115 or 220 Volt power. Each control is at your fingertips on the instrument panel. The spectrophotometer chassis also lifts out of its case to facilitate battery change or inspection. IT'S 2 S P E C T R O P H O T O M E T E R S IN 1 The instruments also perform well for general laboratory use. For analysts who choose to mix their own reagents and calibrate the spectrophotometer on their particular sample, Hach provides special blank meter scales. The instrument may also be fitted with an optional cell adapter which accepts commonly used 1.0 cm. sample cells. N e w H a n d b o o k For W a t e r Analysis A Hach procedures handbook of simplified water and wastewater .' ' analysis is provided with each instrument. Titrations and colorimetric determinations are detailed—more than 70 tests in all. Most procedures are based on Standard Methods but have been carefully simplified so » anyone can perform without previous training. H A C H ) First in Water Analysis
HACH CHEMICAL COMPANY P.O. Box 907, Ames, Iowa 50010 U.S.A. (515) 232-2533, T W X : 910-520-1158 CIRCLE 644 ON READER SERVICE CARD
The most sensitive reagent available for serum iron determinations A product of Hach research This new color reagent can be used either with serum or on a protein-free filtrate. The molar absorptivity of the ironF e r r o Z i n e c o m p l e x is a b o u t 28,000 making it more sensitive than bathophenanthroline and quite suitable for the assay of serum iron or for assays made on biological fluids where iron concentrations of less than 1 m g / l are common. The increased sensitivity obtained from the stable magenta c o l o r of t h e i r o n - F e r r o Z i n e complex makes it possible to monitor therapy of anemic patients on as little as 500 ul of blood serum without resorting to specialized instrumentation. FERROZINE, REAGENT POWDER 3-(2-pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-as-triazine CîoHieOsNflSj
Unit 5 gm 25 gm
Cat. No. 2304-22 2304-24
Price $ 7.50 25.75
Prices FOB Ames, Iowa and subject to change without notice
HACH CHEMICAL CO. P.O. Box 907, Ames, Iowa 50010 U.S.A. 515/232-2533
HACH First in Water Analysis CIRCLE 645 ON READER SERVICE CARD AUGUST 1973 173 LG
