Soil Chemistry CSS 330
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This 6 page Class Notes was uploaded by Rosalind O'Connell on Saturday September 19, 2015. The Class Notes belongs to CSS 330 at Michigan State University taught by Brian Teppen in Fall. Since its upload, it has received 57 views. For similar materials see /class/207204/css-330-michigan-state-university in Soil Science at Michigan State University.
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Date Created: 09/19/15
I C39 3301 Sydney L008 PMLMM gar Amway 17quot 363a 113 19 7e L laws 2 3 C LI NS a 3 d L131 8 2 a LLZLW 64 r Lt 17W 03 Looo It 0 H91 2 409 are Hz VL 4 5 03 b 6M 6015 NW A 25 1ch lt0000 CW 1 j 460 M M 1 1 ELY H x V YMM Mj 9 Lu 5M3 MIL Mg f 1 395 1 7 3 W M3 7 mm Q W13 I rte 3939 3 Mod 605 L C LX M Manx 393 0 MMa1 a L H H k om W quot 3 Lgtlt39 M M f 0 68 m1 mat L M maul L M h I w 6M M3 W gt HM amt 44 M3 k L 1 6OQEMHgtMO gt W LIOKO Wm M3 3 WM amp n 300 ML S olw mgt0 0539 M M fll Lfolvdfm3lt4531 717x542 w o r 0009M Cal 1739 quot39 L lwhm k 9H M quot3913 L LM EMUL cm W 439 29 Wm N4 g WPXI 3N4 2 0 O S 33 000 Ma a I DWgtLELN 0002 MW L L3 3 Na L C 00019 M I 037 L 021 7 I C L W Nif m ij 106 N1 C fvm CO Mat i w 3 6 000 53 4 L 39 M5 4quot L 2 9000 x w m 1 498341 30 W 047 Lmeqli WSBLOH 390 90 elf 0 0 7r3 Sim eg meow 39 L m ow567 39quot Wu NW W3 gmw l M MACH I f a 8 fw arm Mahlmh e h wqw we 09 mm c e S MOIr M040 L PM ywklem MH CWin 393 v836 gt 0 0 510 PH 03 64 v 05 Vbt 0 qfw THEM cdr l I av 2 IxL 000 H l 2 lo Hmgt oo uLgt go V 7 ML W C I go m quotWM mg L mMgtICM 0 000 90 p3 I loo 3 so v13 M3 M3 max m3quot 0 WW 43902 t 113 w M E330 O in HLa x 2 Pin 190 lt7 5 x A in kiwi 5 43 Fe quotm E 6 2 H in surf r H N in 3103 5 WM 5quot VinoZ E Hf w 640 MS 20 17wth W 70 dec ansf N exam fry mug NUS 9 1 71 33 71 5 64 2 14128 ZF 352 3p4 51 Take away m hm Lfs gleam M 3 W kvo Whmowm CA N 1 W nquotamp WW f P39 x L d KOM 0921 1 0032 x log KOW r2 0989 n 11 3909 Kow 1 As the hydrophobicity of an organic compound increases the relative partitioning of a compound from water into both octanol and soil organic matter tend to increase implying that soil organic matter contains hydrophobic domains that behave like a relatively hydrophobic solvent Thus the soil organic matter normalized sorption coef cient KOM for a compound is often correlated strongly With its octanol water partitioning coef cient Kow Equation 766 in the textbook quanti es this relationship as log KOM 0856 0921 log KOW for 11 different halogenated aromatic orgamc solutes see gure at left It is an oversimpli cation to assume that neutral organic compounds sorb to soil only by partitioning into soil organic matter but this simple assumption often works very well Using this assumption please estimate the sorption in mgkg soil of 14 dichlorobenzene log Kow 345 to a soil containing 05 soil organic matter that is in equilibrium With an aqueous solution containing 1001 mgL of 14 dichlorobenzene log Kom for 14 dichlorobenzene sorption of 14 dichlorobenzene by the soil mg 14 dichlorobenzenekg soil 2 While an isotherm is a curve a continuous functional relationship any Single point on the isotherm can be treated as a A All of the above B Distribution coef cient C Determinant of the Whole isotherm if the isotherm is assumed to be linear D Ratio of qceq E Kd a b log K0C 1381 log K0c 0223 39 1004 1 0017 x log K0W r2 0998 n 10 0541 1 0049 x log SW r2 0938 n 10 0 39 I 39 I 39 I 39 I 39 0 39 I 39 I 39 I 39 I 39 10 8 6 4 2 0 2 3 4 5 6 7 log SW mol L391 log Kow c d 5 5 log K0M 0030 log KOM 0856 1 0736 1 0017 x log SW 0921 1 0032 x log KOW 439 r20996 n11 4 r20989 n11 E E o 3 39 o 3 39 K X 8 2 8 2 1 1 0 39 I 39 I 39 I 39 I 39 0 39 I 39 I 39 I 6 5 4 3 2 1 2 3 4 5 log SW mol L391 log KOW 3 Hydrophobicity and hydrophilicity are not really separable properties of compounds but indicate qualitatively different aspects of molecules along the continuum of real substances In general the solubility in water SW of an organic compound is a measure of hydrophilicity and decreases as compounds become more hydrophobic As SW decreases the relative partitioning of a compound into soil organic matter versus water tends to increase because soil organic matter seems to contain hydrophobic domains that behave like a relatively hydrophobic solvent Thus the soil organic matter normalized sorption coef cient KOM tends to increase as SW decreases Equation 765 in the textbook quanti es this relationship as log KOM 0030 0736 log SW for many different halogenated aromatic organic solutes when SW is given in units of molL see gure c at left Using this approximation please estimate the log KOM for chlorobenzene X with a maximum water solubility of 0000335 molL note units It is an oversimpli cation to assume that neutral organic compounds sorb to soil only by partitioning into soil organic matter but this simple assumption often works very well Using this assumption please estimate the sorption of X in mol Xkg soil to a soil containing 103 soil organic matter that is in equilibrium with an aqueous solution containing 0000192 molL of X log Kom for X sorption of X by the soil mol Xkg soil Q mgkg lead adsorption isotherm 200 300 400 C mgL 0 100 500 4 Please consider the isotherm data at left If you were to compute a distribution coef cient KD for adsorption of lead by this soil based on only the right most data point of the isotherm then the KD value would be approximately kg soil L Sorbed amount mgg 5 1n the adsorption isotherms at left data a p a toluene b and etliylbenzene c to a silt loam 39 39 39 soil organic carbon The approxirnate arnount ofeLhylbenzene sorbed by this soil when there is 30 pprn ed1be 39 the soil solution isiimg etbylbenzenelrg soil careful of units At this solutionr 008 0067 004 002 of etliylbenzene to this soil is about Lkg Attliis solutionrphase nitmi n 39 39 carbon normalized distribution coefficient Kcc for the sorption of this cornpound to tliis soil is about Lkg 0c 0 3 Equlllbmlm concentrauon mgL LIIIL39L I 1 LI am 39a I vr r I V r t L cornrnercial horticulture and turfgrass It is typically applied as a granular concenuate sold under the brand narne Talstar a uadernark of PMC The solubility of tliis pesticide in water is very low at about 01 rngL 39 39 39 39 39 quot quot 39 39 t 39 39 39 quotnquot a I quot 39 1 quot 39 39 quot surface and tlienit mm 11 A LIE mani man r 39 39 sorption othis pesticide in mg pesticidekg soil 7 I To measure Mg solpuion 1821g of soil were added to 714 mL of a solution lhat initially contained r t cm t t i i pbase tliencontained 15852 rngL ofMg Ifwe assurne that the soil particles initially contained zero Mg and that all Mg that has disappeared from solution is adsorbed to soil particles tlien how rnucb Mg to the nearest 00001 glrg soil is adsorbed to the soil particles Mg adsorbed in g Mglrg soil 8 H A T contained a concentration of 3038 rnrnolL of sulfate After shaking for 6 hours the system ms ltered and the liquid phase tlien contained 1914 rnrnolL of sulfate If we assurne that the soil cnni r adsorbedtosoil quot 39 39 l l l l H 39 39 39 soil particles Sulfate adsorbed in rnrnol so4lrg soil butimii at In general the i
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