Measurement of transferable chemical residue from nylon carpet using the California roller and a new mega-California roller

Abstract

Human chemical exposures resulting from transfer of surface deposition on indoor nylon carpets may be estimated by measuring transferable residues (mu g chemical/cm2 carpet). A weighted roller developed at California Department of Food and Agriculture (CDFA) has been extensively used to sample transferable residue for estimates of human exposure in risk characterization. A modified roller has been developed to evaluate the influence of pressure on transferable chemical residue since weight and force (or pressure, kg/m2) may vary person-to-person and activity-to-activity. A 30.5 cm diameter roller was used to apply 60 to 2100 kg/m2 to bracket pressures exerted by humans on a flat nylon-carpeted surface. Measurements of transferable cyfluthrin residues were made after 1, 7, and 21 days. Total Soxhlet extractable cyfluthrin residues were relatively constant during the test period. Residue transferability decreased during the study period. Modest increases in the transferability of surface residues were observed over the broad range of pressures applied by the modified roller.

Importance of Fine Particles in Pesticide Runoff from Concrete Surfaces and Its Prediction

“…Although not for runoff prediction, surface wiping has been often used to assess the risk of human exposure to pesticide residues in a variety of settings. , For instance, wiping with cotton fabrics is commonly used to estimate pesticide residues transferable from residential floors in indoor exposure assessment. , Using a similar concept, Li et al analyzed pesticide accumulation on protective gloves to evaluate occupational exposure of fruit-harvesting workers . We tested a similar method by using a 10 × 10 cm Versalon nonwoven sponge (4-ply, Kendall Healthcare, Mansfield, MA) prewet with 10 mL of isopropanol to wipe a given area of concrete surface.…”

Evaluation of a robotic transfer replicator: machine parameters that affect measurements of transfer of particulates from carpet surfaces to human skin versus human skin-like surfaces

“…Many laboratories have performed experiments on the transfer of pesticides and particulates from a variety of donor surfaces to a variety of receptor materials, including human hands and fingers. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] A few of these researchers have calculated the percent transfer (amount transferred/ amount available for transfer). 1 Fewer researchers have documented transfer after multiple transfer events from the same surface.…”