  We present a portable multi-channel, multi-sample UV/vis absorption and
fluorescence detection device, which has no moving parts, can operate
wirelessly and on batteries, interfaces with smart mobile phones or tablets,
and has the sensitivity of commercial instruments costing an order of magnitude
more. We use UV absorption to measure the concentration of ethylene glycol in
water solutions at all levels above those deemed unsafe by the United States
Food and Drug Administration; in addition we use fluorescence to measure the
concentration of d-glucose. Both wavelengths can be used concurrently to
increase measurement robustness and increase detection sensitivity. Our small
robust economical device can be deployed in the absence of laboratory
infrastructure, and therefore may find applications immediately following
natural disasters, and in more general deployment for much broader-based
testing of food, agricultural and household products to prevent outbreaks of
poisoning and disease.
