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Leaching (chemistry)

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through the pores of substance A in order to continue targeting substance B. This penetration can often lead to dissolution of substance A, or the product of more than one solute, both unsatisfactory if specific leaching is desired. The physiochemical and biological properties of the carrier and solute should be considered when observing the
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Due to the assortment of leaching processes there are many variations in the data to be collected through laboratory methods and modeling, making it hard to interpret the data itself. Not only is the specified leaching process important, but also the focus of the experimentation itself. For instance,
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Substance A and B are somewhat homogenous in a system prior to the introduction of substance C. At the beginning of the leaching process, substance C will work at dissolving the surficial substance B at a fairly high rate. The rate of dissolution will decrease substantially once it needs to penetrate
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is highly dependent on the characteristics of the soil, which makes modeling efforts difficult. Most leaching comes from infiltration of water, a washing effect much like that described for the leaching process of biological substances. The leaching is typically described by solute transport models,
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In an ideal leaching equilibrium stage, all the solute is dissolved by the solvent, leaving the carrier of the solute unchanged. The process of leaching however is not always ideal, and can be quite complex to understand and replicate, and often different methodologies will produce different
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such as vanadium, Cobalt, Nickel, Manganese, Iron etc. from raw materials/ reused materials. In recent years, there has been more attention given to metal leaching to recover precious metals from waste materials. For example, the extraction of valuable metals from wastewater.
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Coal fly ash is a product that experiences heavy amounts of leaching during disposal. Though the re-use of fly ash in other materials such as concrete and bricks is encouraged, still much of it in the United States is disposed of in holding ponds,
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Leaching is a naturally occurring process which scientists have adapted for a variety of applications with a variety of methods. Specific extraction methods depend on the soluble characteristics relative to the
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material such as concentration, distribution, nature, and size. Leaching can occur naturally seen from plant substances (inorganic and organic), solute leaching in soil, and in the decomposition of
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Rohwerder, T.; Gehrke, T.; Kinzler, K.; Sand, W. (2003). "Bioleaching review part A: Progress in bioleaching: Fundamentals and mechanisms of bacterial metal sulfide oxidation".
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show that the optimal conditions are 2.0 m/L of organic acid at a temperature of 90 Â°C. The reaction had an overall efficiency exceeding 90% with no harmful byproducts.
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Li, Li; Jing Ge; Feng Wu; Renjie Chen; Shi Chen; Borong Wu (2010). "Recovery of cobalt and lithium from spent lithium ion batteries using organic citric acid as leachant".
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Leaching can sometimes be used to extract valuable materials from a wastewater product/ raw materials. In the field of mineralogy, acid leaching is common to extract
1279:"Extraction of pure Co, Ni, Mn, and Fe compounds from spent Li-ion batteries by reductive leaching and combined oxidative precipitation in chloride media" 422:, heat, or simply washing with water. A summary of various leaching processes and their respective laboratory tests can be viewed in the following table: 85:
There are many types of leaching scenarios; therefore, the extent of this topic is vast. In general, however, the three substances can be described as:
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Perket, C.L.; Webster, W.C. (1981). "Literature Review of Batch Laboratory Leaching and Extraction Procedures". In Conway, R.; Malloy, B. (eds.).
322: 1475: 1323:"Comprehensive extraction of valuable metals from waste ternary lithium batteries via roasting and leaching: Thermodynamic and kinetic studies" 759:
Dubus, I.G.; Beulke, S.; Brown, C.D. (2002). "Calibration of pesticide leaching models: critical review and guidance for reporting".
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that the soil has been consolidated to via stress. Diffusion is controlled by other factors such as pore size and soil skeleton,
1232:"Optimization and kinetic analysis of direct acid leaching of vanadium from converter vanadium slag under atmospheric pressure" 1230:
Xiong, Yuting; Wang, Ling; Wang, Long; Li, Shen; Yang, Guohua; Cao, Chong; Liu, Shuxian; Nie, Yimiao; Jia, Lanbo (2023-07-01).
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substances can experience leaching themselves, as well as be used for leaching as part of the solvent substance to recover
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showed similar results with an optimal temperature and concentration of 90 Â°C and 1.5 molar solution of citric acid.
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Richardson, J. F.; Harker, J. H.; Backhurst, J. R. (2002), Richardson, J. F.; Harker, J. H.; Backhurst, J. R. (eds.),
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as a group or individually, or the solvent that causes leaching. Most tests are done by evaluating mass loss due to a
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Addiscott, T. M.; Wagenet, R. J. (1985). "Concepts of solute leaching in soils: a review of modelling approaches".
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Kingston Fossil Plant structural failure lead to massive destruction throughout the area and serious levels of
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Bärlocher, Felix (2005), Graça, M.A.S.; Bärlocher, Felix; Gessner, M.O. (eds.), "CHAPTER 5 - Leaching",
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Prosser, A.P. (1996). "Review of uncertainty in the collection and interpretation of leaching data".
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with some success. Experiments performed with varying temperatures and concentrations of
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Gu, Kunhong; Zheng, Weipeng; Ding, Bodong; Han, Junwei; Qin, Wenqing (2022-08-01).
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Light Petroleum Fractions, Trichlorethylene Solvent, or Acetone/Ether Solvent
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International Journal of Integrated Waste Management, Science and Technology
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Some recent work has been done to see if organic acids can be used to leach
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The general process is typically broken up and summarized into three parts:
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Extraction of some soluble substances from a solid material into a liquid
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Li, Li; Jing Ge; Renjie Chen; Feng Wu; Shi Chen; Xiaoxiao Zhang (2010).
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becoming detached or extracted from its carrier substance by way of a
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of inner-solute through the pores of the carrier to reach the solvent
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Leaching occurring in a cement wall due to natural weathering events.
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Iyer, R. (2002). "The surface chemistry of leaching coal fly ash".
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of flow path, and distribution of the solvent (water) and solutes.
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the focus could be directed toward mechanisms causing leaching,
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Tukey, H.B. (1970). "The Leaching of Substances from Plants".
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materials. Leaching can also be applied affectedly to enhance
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Table 1: Laboratory Tests for Various Leaching Processes
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Peelman, S.; Sun, Z.H.I.; Sietsma, J.; Yang, Y. (2016),
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Methods to Study Litter Decomposition: A Practical Guide
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processes. This process is done in most part to extract
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and contaminant removal, as well as for disposal of
1277:Balázs IllĂ©s, István; KĂ©kesi, Tamás (2023-10-01). 1276: 490:Agitation by Mechanical Stirrer or Compressed Air 389: 1207:"Kingston Fossil Plant coal fly ash slurry spill" 303: 1815: 812: 758: 186:. Many plants experience leaching of phenolics, 1229: 1061:Hazardous Solid Waste Testing: First Conference 1320: 1173: 1171: 244:is a term that describes the removal of metal 170:Transfer of dissolved solute out of the system 1469: 1058: 348: 1316: 1314: 175:Leaching processes for biological substances 1180:Transport Process and Separation Principles 1168: 1476: 1462: 1177: 161:Dissolution of surficial solute by solvent 1311: 1294: 852: 1483: 857:, Springer Netherlands, pp. 33–36, 71: 1182:. NJ: Pretence Hall. pp. 802–817. 1139: 1816: 898:Applied Microbiology and Biotechnology 665: 663: 661: 659: 657: 655: 653: 651: 408: 1457: 1201: 1199: 1135: 1133: 1131: 1129: 1127: 1125: 1123: 1054: 1052: 1050: 1048: 1046: 1044: 1042: 999: 997: 953: 951: 949: 947: 945: 943: 891: 889: 887: 885: 883: 881: 848: 846: 844: 808: 806: 804: 802: 800: 798: 716: 712: 710: 708: 706: 704: 702: 649: 647: 645: 643: 641: 639: 637: 635: 633: 631: 80: 957: 754: 752: 750: 748: 676:Chemical Engineering (Fifth Edition) 731:10.1146/annurev.pp.21.060170.001513 374:of the soil, which is dependent on 13: 1196: 1120: 1039: 1018:10.1016/b978-0-12-802328-0.00021-8 994: 940: 878: 841: 827:10.1111/j.1365-2389.1985.tb00347.x 795: 699: 684:10.1016/b978-0-08-049064-9.50021-7 628: 14: 1840: 745: 719:Annual Review of Plant Physiology 497:Environmentally friendly leaching 1657: 230:are leached and carried through 1407: 1361: 1270: 1223: 466:Evaporation from Disposal Pond 390:Leaching for mineral extraction 1416:Journal of Hazardous Materials 1012:, Elsevier, pp. 319–334, 960:Journal of Hazardous Materials 455:Mobilization of Metal Cations 304:Leaching processes for fly ash 214:nutrients from plants such as 1: 1428:10.1016/j.jhazmat.2009.11.026 1178:Geankoplis, Christie (2004). 972:10.1016/S0304-3894(02)00049-3 621: 1386:10.1016/j.wasman.2010.08.008 1339:10.1016/j.mineng.2022.107736 1296:10.1016/j.mineng.2023.108169 1248:10.1016/j.mineng.2023.108091 1154:10.1016/0304-386X(95)00071-N 238:to human and animal health. 7: 584: 450:t-test or permutation test 95:and a solvent, substance C. 10: 1845: 1694:Electrostatic precipitator 442:Batch Test or Column Test 393: 349:Leaching processes in soil 331:Tennessee Valley Authority 18: 1795: 1767: 1734:Rotary vacuum-drum filter 1666: 1655: 1491: 910:10.1007/s00253-003-1448-7 134:of the carrier and solute 1777:Aqueous two-phase system 1599:Liquid–liquid extraction 1674:API oil–water separator 1544:Dissolved air flotation 863:10.1007/1-4020-3466-0_5 815:Journal of Soil Science 761:Pest Management Science 672:"CHAPTER 10 - Leaching" 577:The same analysis with 479:Coarse Solids Leaching 439:Waste Leachate Removal 89:a carrier, substance A; 1829:Solid-solid separation 1639:Solid-phase extraction 372:hydraulic conductivity 92:a solute, substance B; 77: 1759:Vacuum ceramic filter 1754:Sublimation apparatus 1559:Electrochromatography 1519:Cross-flow filtration 1112:CS1 maint: location ( 487:Fine Solids Leaching 447:Leaching from Plants 396:Leaching (metallurgy) 323:Kingston Fossil Plant 148:Intermediate products 75: 1824:Industrial processes 1709:Fractionating column 1504:Acid–base extraction 1485:Separation processes 1376:. Waste Management. 1327:Minerals Engineering 1283:Minerals Engineering 1236:Minerals Engineering 1010:Rare Earths Industry 471:Cellular Extraction 29:is the process of a 19:For other uses, see 1529:Cyclonic separation 606:Surfactant leaching 427: 409:Leaching mechanisms 337:downstream to both 63:rare earth elements 1589:Gravity separation 425: 81:Leaching processes 78: 1811: 1810: 1729:Rapid sand filter 1624:Recrystallization 1604:Electroextraction 1564:Electrofiltration 1380:(12): 2615–2621. 1189:978-0-13-101367-4 1078:978-0-8031-0795-3 1069:10.1520/stp28826s 549:(liquid) + 4 Co(C 494: 493: 463:Leaching Fly Ash 434:Laboratory Tests 431:Leaching Process 366:expressions, and 329:, Tennessee. The 232:stormwater runoff 152:Crystal structure 57:products such as 1836: 1661: 1478: 1471: 1464: 1455: 1454: 1448: 1447: 1422:(1–3): 288–293. 1411: 1405: 1404: 1402: 1400: 1365: 1359: 1358: 1318: 1309: 1308: 1298: 1274: 1268: 1267: 1227: 1221: 1220: 1219: 1218: 1203: 1194: 1193: 1175: 1166: 1165: 1137: 1118: 1117: 1110: 1104: 1100: 1098: 1090: 1056: 1037: 1036: 1035: 1034: 1001: 992: 991: 955: 938: 937: 893: 876: 875: 850: 839: 838: 810: 793: 792: 756: 743: 742: 714: 697: 696: 667: 537:(liquid) → 4 LiC 428: 424: 380:relative density 222:substances, and 102:leaching process 1844: 1843: 1839: 1838: 1837: 1835: 1834: 1833: 1814: 1813: 1812: 1807: 1791: 1769: 1763: 1724:Protein skimmer 1662: 1653: 1649:Ultrafiltration 1629:Reverse osmosis 1609:Microfiltration 1584:Froth flotation 1524:Crystallization 1487: 1482: 1452: 1451: 1412: 1408: 1398: 1396: 1366: 1362: 1319: 1312: 1275: 1271: 1228: 1224: 1216: 1214: 1205: 1204: 1197: 1190: 1176: 1169: 1142:Hydrometallurgy 1138: 1121: 1111: 1102: 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1038: 1026: 993: 966:(3): 321–329. 939: 904:(3): 239–248. 877: 871: 840: 821:(3): 411–424. 794: 773:10.1002/ps.526 767:(8): 745–758. 744: 725:(1): 305–324. 698: 692: 626: 625: 623: 620: 619: 618: 613: 608: 603: 598: 593: 586: 583: 575: 574: 570: 566: 565:(liquid) + 6 H 562: 558: 554: 550: 546: 542: 538: 534: 530: 526: 525:(solid) + 12 C 522: 498: 495: 492: 491: 488: 484: 483: 480: 476: 475: 472: 468: 467: 464: 460: 459: 456: 452: 451: 448: 444: 443: 440: 436: 435: 432: 410: 407: 394:Main article: 391: 388: 350: 347: 305: 302: 292:by recovering 252:by biological 224:sugar alcohols 176: 173: 172: 171: 168: 162: 155: 154: 149: 146: 141: 135: 129: 124: 121: 116: 111: 97: 96: 93: 90: 82: 79: 15: 9: 6: 4: 3: 2: 1841: 1830: 1827: 1825: 1822: 1821: 1819: 1804: 1801: 1800: 1798: 1794: 1788: 1785: 1783: 1780: 1778: 1775: 1774: 1772: 1766: 1760: 1757: 1755: 1752: 1750: 1747: 1745: 1744:Spinning cone 1742: 1740: 1737: 1735: 1732: 1730: 1727: 1725: 1722: 1720: 1719:Mixer-settler 1717: 1715: 1712: 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381: 377: 376:particle size 373: 369: 365: 361: 356: 346: 344: 340: 336: 335:contamination 332: 328: 324: 320: 316: 312: 301: 299: 298:sulfuric acid 295: 291: 287: 283: 279: 275: 271: 267: 263: 259: 255: 251: 247: 243: 239: 237: 233: 229: 225: 221: 217: 213: 209: 205: 201: 197: 193: 189: 188:carbohydrates 185: 181: 169: 166: 163: 160: 159: 158: 153: 150: 147: 145: 142: 139: 138:Microorganism 136: 133: 130: 128: 125: 122: 120: 117: 115: 112: 110: 109:Particle size 107: 106: 105: 103: 94: 91: 88: 87: 86: 74: 70: 66: 64: 60: 56: 52: 51:water quality 48: 44: 38: 36: 32: 28: 22: 1704:Filter press 1689:Depth filter 1593: 1579:Flocculation 1549:Distillation 1419: 1415: 1409: 1399:December 22, 1397:. Retrieved 1377: 1373: 1363: 1330: 1326: 1286: 1282: 1272: 1239: 1235: 1225: 1215:, retrieved 1213:, 2019-11-18 1210: 1179: 1145: 1141: 1060: 1031:, retrieved 1009: 963: 959: 901: 897: 854: 818: 814: 764: 760: 722: 718: 675: 576: 500: 482:Batch Plant 458:Bioleaching 412: 399: 353:Leaching in 352: 343:Clinch River 327:Roane County 307: 258:complexation 240: 184:heavy metals 178: 156: 127:Surface area 101: 98: 84: 67: 39: 26: 25: 1679:Belt filter 1644:Sublimation 1534:Decantation 579:citric acid 509:from spent 360:Darcy's Law 339:Emory River 242:Bioleaching 216:free sugars 192:amino acids 132:Homogeneity 119:Temperature 1818:Categories 1768:Multiphase 1699:Evaporator 1684:Centrifuge 1574:Filtration 1569:Extraction 1509:Adsorption 1499:Absorption 1333:: 107736. 1289:: 108169. 1242:: 108091. 1217:2019-11-21 1033:2019-10-17 622:References 616:Weathering 601:Parboiling 591:Extraction 515:malic acid 416:mineralogy 384:tortuosity 228:pesticides 180:Biological 144:Mineralogy 1782:Azeotrope 1492:Processes 1355:250639975 1347:0892-6875 1305:0892-6875 1264:258423709 1256:0892-6875 1211:Knowledge 1162:0304-386X 1105:ignored ( 1095:cite book 1087:1040-3094 980:0304-3894 918:1432-0614 835:1365-2389 781:1526-4998 739:0066-4294 511:batteries 368:diffusion 364:mass flow 315:landfills 254:oxidation 165:Diffusion 123:Agitation 1796:Concepts 1787:Eutectic 1739:Scrubber 1714:Leachate 1594:Leaching 1539:Dialysis 1444:17075350 1436:19954882 1394:20817431 988:12137992 934:25547087 926:14566432 789:12192898 611:Sorption 596:Leachate 585:See also 358:such as 319:elements 294:aluminum 282:sulfides 140:activity 69:results. 27:Leaching 21:Leaching 1770:systems 1667:Devices 1614:Osmosis 521:4 LiCoO 503:lithium 420:reagent 311:lagoons 290:fly ash 278:uranium 246:cations 212:organic 114:Solvent 59:fly ash 47:organic 43:sorbent 35:solvent 1554:Drying 1442:  1434:  1392:  1353:  1345:  1303:  1262:  1254:  1186:  1160:  1085:  1075:  1024:  986:  978:  932:  924:  916:  869:  833:  787:  779:  737:  690:  507:cobalt 402:Metals 296:using 286:oxides 276:, and 270:nickel 266:cobalt 262:copper 220:pectic 206:, and 190:, and 31:solute 1749:Still 1440:S2CID 1351:S2CID 1260:S2CID 930:S2CID 573:(gas) 236:toxic 61:, or 1432:PMID 1401:2011 1390:PMID 1343:ISSN 1301:ISSN 1252:ISSN 1184:ISBN 1158:ISSN 1114:link 1107:help 1083:ISSN 1073:ISBN 1022:ISBN 984:PMID 976:ISSN 922:PMID 914:ISSN 867:ISBN 831:ISSN 785:PMID 777:ISSN 735:ISSN 688:ISBN 505:and 378:and 355:soil 341:and 274:zinc 256:and 250:ores 204:mist 196:rain 1424:doi 1420:176 1382:doi 1335:doi 1331:186 1291:doi 1287:201 1244:doi 1240:198 1150:doi 1065:doi 1014:doi 968:doi 906:doi 859:doi 823:doi 769:doi 727:doi 680:doi 325:in 284:or 208:fog 200:dew 1820:: 1438:. 1430:. 1418:. 1388:. 1378:30 1372:. 1349:. 1341:. 1329:. 1325:. 1313:^ 1299:. 1285:. 1281:. 1258:. 1250:. 1238:. 1234:. 1209:, 1198:^ 1170:^ 1156:. 1146:41 1144:. 1122:^ 1099:: 1097:}} 1093:{{ 1081:. 1071:. 1041:^ 1020:, 1008:, 996:^ 982:. 974:. 964:93 962:. 942:^ 928:. 920:. 912:. 902:63 900:. 880:^ 865:, 843:^ 829:. 819:36 817:. 797:^ 783:. 775:. 765:58 763:. 747:^ 733:. 723:21 721:. 701:^ 686:, 674:, 630:^ 362:, 345:. 313:, 300:. 272:, 268:, 264:, 218:, 202:, 198:, 37:. 1477:e 1470:t 1463:v 1446:. 1426:: 1403:. 1384:: 1357:. 1337:: 1307:. 1293:: 1266:. 1246:: 1192:. 1164:. 1152:: 1116:) 1109:) 1067:: 1016:: 990:. 970:: 936:. 908:: 861:: 837:. 825:: 791:. 771:: 741:. 729:: 682:: 571:2 567:2 563:2 561:) 559:5 557:O 555:6 553:H 551:4 547:5 545:O 543:5 541:H 539:4 535:5 533:O 531:6 529:H 527:4 523:2 23:.

Index

Leaching
solute
solvent
sorbent
organic
water quality
hazardous waste
fly ash
rare earth elements

Particle size
Solvent
Temperature
Surface area
Homogeneity
Microorganism
Mineralogy
Crystal structure
Diffusion
Biological
heavy metals
carbohydrates
amino acids
rain
dew
mist
fog
organic
free sugars
pectic

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