Per‐ and polyfluoroalkyl substances (PFAS) have been used in aqueous film‐forming foams used in firefighting, resulting in soil and groundwater contamination and leading to human exposure via animal products grown in contaminated areas. The present study reports the relationship between PFAS intake by hens and the PFAS concentrations in the edible parts of eggs. Laying hens were exposed via drinking water to different concentrations of 4 PFAS compounds (perfluorooctane sulfonate [PFOS], perfluorohexane sulfonate [PFHxS], perfluorooctanoic acid [PFOA], and perfluorohexanoic acid) over 61 d. Egg PFAS residues were assessed for a further 30 d after exposure ceased. The target concentrations of PFAS were 0, 0.3, 3, 30, and 300 µg/L for the treatment groups T1–T5, respectively; and PFAS residues were determined from the eggs collected every second day. There was a linear correlation between the PFAS concentrations in the drinking water of hens and those detected in the egg, which could be useful in estimating PFAS concentrations in the egg by measuring water concentrations. Exposure of hens to drinking water with PFAS concentrations below the Australian Government Department of Health limits (PFOS and PFHxS, 0.07 µg/L; PFOA, 0.56 µg/L), and with no other sources of PFAS exposure, is unlikely to result in egg PFAS concentrations that would exceed the 10% limit set by Food Standards Australia New Zealand for human consumption. Environ Toxicol Chem 2021;40:735–743. © 2020 SETAC

Indonesia memiliki areal perkebunan karet terluas di dunia, yaitu sekitar 3,67 juta Ha pada tahun 2017, namun dari sisi produksi hanya berada pada posisi kedua setelah Thailand. Penelitian ini bertujuan untuk mengetahui karakteristik fisiologis dan hasil lateks tanaman karet klon GT 1 dengan perlakuan sistem sadap pendek di perkebunan karet rakyat. Penelitian dilaksanakan di Desa Halaban Dusun Sidorejo Kecamatan Besitang Kabupaten Langkat Provinsi Sumatera Utara dengan ketinggian tempat 500-700 m dpl dan jenis tanah ultisol. Penelitian menggunakan Rancangan Acak Kelompok Non-faktorial dengan lima ulangan dan tiga perlakuan sistem sadap. Hasil penelitian menunjukkan bahwa pada periode Januari-Juni, kadar fosfat anorganik (FA) lebih tinggi pada perlakuan panjang alur sadap S/4 d3 ET 2,5% dibandingkan dengan panjang alur sadap S/2 d3 ET 2,5%, dan S/8 d3 ET 2,5%. Hasil lateks dengan panjang alur sadap S/2 d3 ET 2,5% lebih tinggi pada saat daun tanaman karet optimal (Januari), dan awal gugur daun (Februari), sedangkan hasil lateks pada fase awal daun baru (Maret-April), dan daun flush (Mei-Juni), lebih tinggi pada panjang alur sadap lebih pendek (S/8 d3 ET 2,5%).