Griess-doped polyvinyl alcohol thin film for on-site simultaneous sample preparation and nitrite determination of processed meat products

•G-PVA film was developed for on-site determination of nitrite in processed meat.•Both in-tube detection and sample preparation were achieved by developed test kit.•Detection limit of 12.6 µg L−1 NaNO2 was obtained with good precision and accuracy.•700 processed meat products and 15 tuna samples were analyzed and reported.•The method can be applied for on-site use to improve dietary nitrite levels and public health. To facilitate on-site nitrite determination for processed meat products, Griess-doped polyvinyl alcohol film was synthesized in the bottom of a plastic tube for in-tube determination. The tube’s aperture was used to control the sample dimensions. Each sample, cut into eight sectors, was subjected to nitrite extraction by water. Use of tap water or commercial drinking water vs. ultrapure water was associated with 0.05, n = 45).