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Mercury detector based on the principles of flameless atomic absorption can detect as little as 0.12 ppb mercury vapor in air and can also be used for the detection of other pollutants such as SO» and H2S. The sample and reference cells, 7.5 mm in diam and 30 cm in length, are illuminated by a low-pressure mercury lamp which emits uv light at 254 nm. $1800. Laboratory Data Control. 305-844-5241 404
Model 700 calcium titrator based on a fluorometric end point includes a full supply of accessories and chemicals for its use. Fiske Assoc, Inc. 617278-2482 405 New tic plates coated with Supelcosil42A resemble the Rouser plates which separate lipid mixtures by two-dimen sional tic. These plates are more sensi tive than the usual ones and provide ideal separation for routine analysis. 20 plates cost $32. Supelco, Inc. 814-359-2732 406 Lab camera stand, Repro-Star, for ,photographing thin layer chromatoigrams and electropherograms consists ,of multilamp housings, quick-change camera holder, pushbutton light selec tor, and a base with transmitted light source. Basic price with camera is $975. Camag, Inc. 414-476-7655 407 Automatic range expander enables strip chart recorders attached to lab instru ments to record off-scale data without attenuating or decreasing instrument sensitivity. The expander automati cally returns the recorder pen to zero when it begins to go off scale. $495. Cahn Instruments. 213-634-7840 4 0 8 Chloride analyzer, IL 279, requires less than 20 sec to complete the simplified procedure; readout is digital, directly in milliequivalents per liter. Sample re quired is about 150 μ\; precision is better than 1 % . $995. Instrumenta tion Laboratory, Inc. 617-861-0710
409
7417 portable pH meter includes an optional accessory module which is a specially designed lid to house an elec trode holder and support, a combina tion electrode, chemicals, thermometer, wash bottle, beakers, and other items. The battery-operated meter has a rela tive accuracy of ± 0.05 pH and a maxi mum drift of less than 0.005 pH per day or less than 0.002 pH per °C. Manual temperature compensation from 0 to 100° is accurate to ± 2°C. Price of the basic instrument is $300; with accessory module, $350. Leeds & Northrup. 215-643-2000 410 Kevex-Ray 3000 Mark A consists of a 30-mm 2 (Si) or (Li) detector and a quality cryostat. The instrument has a resolution of 235 eV for 5.9 keV and 275 for 14 keV X-rays. It can withstand a weekend at room temperature with out degrading resolution in the event that the liquid nitrogen Dewar was not filled. The company also makes an ultrahigh-resolution spectrometer called the Mark AA. The low-cost model sells for $2222. Kevex Corp. 415-697-6901
411 Strip chart recorders, 3y2 in. high, use linear servomotor pen drive. Model 7123A/B uses chart paper with 10-in. wide grid; Model 7143A/B takes paper with 5-in. grid; a choice of configura tions allows custom design. Input ranges from 1 mV to 100 V; chart speed is by option. 10-in. costs $750; 5-in. costs $695. Hewlett-Packard Co. 415326-7000 412
FITTING ASSORTMENT BOX 8 0 Pieces Packed in a hinged top clear styrene box. A fine assortment of every thing needed in daily routine set-ups. Straight Tubing Connectors, Straight-Stepped Tubing Connectors, Τ Connectors, Y Connectors, Quick Disconnects, Poly ethylene Cup-Type Stoppers.
Also
available:
Assortment of Y and Τ Polypropylene Connectors. Bag of 12 (one of each size). Assortment of Polyethylene Quick Dis connects. Bag of 12 (two of each size). Assortment of Polypropylene Straight and Straight-Stepped autoclavable tub ing connectors. Bag of 20 (two of each size). Assortment of Polyethylene Standard Taper Bottle Stoppers. Bag of 12 (two of each size). Assortment of Polyethylene Cup Type Stoppers. Bag of 24 (two of each size). At your nearest laboratory supply house. Send for our NEW 84 page catalog 970. For your FREE copy write Dept. A-4
BEL-ART PRODUCTS PEQUANNOCK, N. J. 0 7 4 4 0 The MOST COMPLETE line of Plastic L a b o r a t o r y W a r e a v a i l a b l e f r o m O N E source
See us at FASEB Booths A-29-A-30 Circle No. 25 on Readers' Service Card
ANALYTICAL CHEMISTRY, VOL. 43, NO. 4, APRIL 1971 ·
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