[en] The assessment of the quality control of radiopharmaceuticals used for diagnostic examinations in nuclear medicine is essential to obtain adequate images as well as to avoid unnecessary dose to the patient. The most of radiopharmaceuticals are labeled with ^99mTc eluate obtained from ^99Mo-^99mTc generator. Before the labeling procedure, the eluate must be evaluated about its radionuclidic, radiochemical and chemical purities and pH, also. This study aims to evaluate the quality of ⁹⁹Mo-⁹⁹mTc generators used in nuclear medicine departments in Recife, Brazil. To determine the ⁹⁹Mo content of the eluate, it was employed the attenuation method using a 6 mm thick lead cylinder. For chemical purity test, it was used a semi-quantitative colorimetrical test with standard solutions of Al³⁺ with concentrations of 5, 10 and 20ppm. The pH evaluation was performed with the universal pH strip (Merck). Radiochemical purity was determined by thin-layer chromatography on silica gel aluminum foil (Sorbentia Technologies) that it was cut in strips of 1x10cm. The solvents were acetone and saline. It was observed that about 2.0% of samples showed levels of ⁹⁹Mo above the reference value. Two samples are outside of the recommended Al³⁺ concentration. Concerning the pH test, all samples were within the expected range. In relation to the content of free pertechnetate, 40% of samples showed values of Rf outside of the European and U.S. Pharmacopoeias recommendations. Thus, it is necessary to implement a quality control program of the eluate in clinics of nuclear medicine. (author)