/famaA. offers a complete, self-contained system for determination of mercury.

APPLICATIONS This compact system

can be used in many scientific fields.

Pollution: air, water, food,

soil, tissue. Clinical:

urine, blood, tissue. Industrial Control:

food, metal, soil, fertilizer.

In stock for immediate shipment.

Call or write for Bulletin B-350.

Coleman Model MAS-50

Mercury Analyzer This easy-to-operate unit displays mercury content of sample directly in micrograms. Dual ranges are 0-9 micrograms and 0-0.28 microgram full scale. Sensitivity is 0.01 microgram of mercury and reproducibility is better than 3%.

Features simple sample preparation utilizing Hatch and Ott stannous chloride reduction and subsequent bub­bling of mercury vapor through a closed system for detection by "cold atomic absorption" technique.

Instrument has rapid response with "memory" system to hold peak reading until released. Other features in­clude simple 5-step procedure of reagent addition. A mercury-free reagent kit is available.

Inexpensive and complete, the Coleman MAS-50 can release more expensive atomic absorption instrumenta­tion for other uses and provides a higher degree of accuracy.

Thomas ARTHUR H. THOMAS COMRANY Scientific Apparatus and Reagents

VINE STREET AT 3RD · P.O. BOX 7 7 9 · PHILADELPHIA, PA. 19105, U.S.A. Circle No. 176 on Readers' Service Card

94 A . ANALYTICAL CHEMISTRY, VOL. 43, NO. 3, MARCH 1971