POISONOUS METALS ON SPRAYED FRUITS AND VEGETABLES. 



27 



Some of the samples from New Jersey reported in Table 11 represent 

 plots which were purposely oversprayed and contain relatively large 

 amounts of spray residues. The lots sprayed according to recom- 

 mended schedule contain much less spray residue. Samples 27340 

 and 27349 show a comparatively large amount of spray residue, but 

 these samples are from experimental plots which were sprayed late. 

 The other Massachusetts samples show very little spray residue. 

 The results indicate that when sprayed with the regulation spray and 

 washed before using the berries contain but little spray material. 



Table 12. — Copper, lead, and arsenic remaining on sprayed grapes at picking time. 



Sam- 

 ple 

 No. 



Spray material used. 



1915. 



23565' 2i lbs. lead arsenate June 4, July Unwashed, 

 (powder), 4-4-50 Bor- 16. Washed 3 



deaux.2 



235661 1 lb. lead arsenate do Unwashed. 



(powder), 4-4-50 Bor- Washed ^ . . 



deaux.2 



23567 ' Check plat (unsprayed)^ 



23571 1 Cheek plat (unsprayed) 



235721 3 lbs. lead arsenate July 6. Unwashed 



(paste), 2 lbs. fish-oil Washed 3 



soap, 3-3-50 Bor- 

 deaux (sprayed with 

 coarse nozzle). 



lbs. lead arsenate July 19. 

 (paste), 1 lb. laundry 

 soap, 3-3-50 Bor- 

 deaux (sprayed with 

 coarse nozzle).' 



23573 1 5 lbs. lead arsenate July 6. Unwashed . 



(paste), 2 lbs. fish-oil Washed 3 . . 



soap, 3-3-50 Bor- 

 deaux (sprayed with 

 coarse nozzle)! 



lbs. lead arsenate July 19. 

 (paste), 1 lb. laundry 

 soap, 3-3-50 Bor- 

 deaux (sprayed with 

 coarse nozzle). < 



23574 1 5 lbs. lead arsenate July 6. Unwashed . 



(paste), 2 lbs. fish-oil Washed s . . 



soap, 3-3-50 Bor- 

 deaux (oversprayed, 

 coarse nozzle). 



lbs. lead arsenate July 19. 

 (paste), 1 lb. laundry 

 soap, 3-3-50 Bor- 

 deaux (oversprayed, 

 coarse nozzle).' 



236881 3 lbs. lead arsenate July 5, 17. Unwashed, 

 (paste), 3-3-50 Bor- Washed 3.. 



deaux (sprayed with 

 trailers, using fine 

 nozzles).' 



236891 3 lbs. lead arsenate do Unwashed 



(paste), 1 lb. laundry Washed 3 



soap, 3-3-50 Bor- 

 deaux (sprayed with 

 trailers, using fine 

 nozzles) (normal 

 schedule for this re- 

 gion).5 



1 Concord. 



' Harvested Oct. 9, 1915, Benton Harbor, Mich. 



' Samples washed in running tap water. 



< Harvested Oct. 9, 1915, North East, Pa. 



' Harvested Oct. 27, 1915, North East, Pa. 



Date 

 sprayed. 



Condition 

 of samples 

 analyzed. 



Arsenic 



(As). 



Orig- 

 inal 

 fruit. 



Dried 

 fruit. 



Lead (Pb). 



'-Orig- 

 inal 

 fruit. 



Dried 



fruit. 



Copper 



(Cu). 



Orig- 

 inal 

 fruit. 



Dried 

 fruit. 



0.25 

 .14 



.13' 

 .13 



.07 

 .07 

 .44 

 .30 



ParU per million. 



1.50 



.80 



2.6 

 2.4 



15.1 

 14.0 



0.8 

 .6 



.80 

 .80 



2.1 

 1.3 



13.1 

 8.1 



.7 

 .6 



.40 



.40 



2.70 



1.80 



1.1 



.6 

 1.4 

 1.2 



6.8 

 3.2 

 8.4 

 7.2 



.4 

 .4 

 1.3 

 1.1 



4.80 

 2.10 



2.4 

 1.3 



14.4 



7.8 



1.5 

 1.1 



4.70 

 2.10 



8.2 

 2.4 



48.5 

 14.2 



1.8 

 1.4 



1.90 

 1.90 



1.5 



1.2 



7.1 



5.7 



1.2 



.7 



3.90 

 2.40 



2.4 

 1.4 



11.5 

 6.7 



1.8 

 1.2 



4.7 

 3.4 



P.ct. 

 82.8 



4.4 

 3.8 



84.0 



2.5 

 2.1 

 7.8 

 6.6 



83.9 

 81.0 

 83.4 



9.0 

 6.6 



10.7 

 8.3 



5.7 

 3.3 



8.7 

 5.8 



Loss 

 on 

 dry- 

 ing. 



83.3 



83.1 



79.0 



79.2 



