Quantitative Analysis of Total Petroleum Hydrocarbons in Soils: Comparison between Reflectance Spectroscopy and Solvent Extraction by 3 Certified Laboratories

Table 2

Soil samples calculated concentration, projected TPH, and laboratory TPH results.

Sample	Soil; name	Contaminant	Calculated concentration (ppm)	Projected  TPH	Spectroscopy  (TPH)	Lab A (TPH)			Lab B (TPH)			Lab C (TPH)
						Min	Max	Avg	Min	Max	Avg	Min	Max	Avg
1	Hamra	None	0	0	411	6	8	7	10	10	10	10	10	10
2		Diesel	450	567	908	354	434	394	599	610	605	458	506	483
3			4500	5674	4617	4575	5288	4932	6179	6292	6236	3730	4480	4111
4			10500	13239	8693	8122	8175	8149	14534	15369	14952	9897	10217	10021
5		Kerosene	550	670	953	277	320	299	405	415	410	305	383	350
6			6000	7304	4871	5455	6039	5747	7441	7528	7485	3420	3814	3628
7			12000	14609	8567	8740	9608	9174	14078	14125	14102	9410	9880	9704
8		95% octane	600	365	511	39	43	41	52	66	59	47	56	51
9			5500	3348	1274	519	586	553	793	838	816	244	333	300
10			9500	5783	1800	1227	1816	1522	1142	2003	1573	260	312	279
11	Loess	None	0	0	10	9	9	9	10	10	10	10	15	12
12		Diesel	500	630	1378	252	275	264	615	625	620	483	510	498
13			2500	3152	2545	1139	2308	1724	3593	3601	3597	2816	3055	2936
14			9000	11348	6062	5984	7303	6644	12447	12958	12703	7970	8560	8313
15		Kerosene	400	487	909	128	145	137	345	354	350	210	255	236
16			4000	4870	3182	2606	3250	2928	4687	4698	4693	2145	2312	2219
17			11000	13391	6495	9435	9628	9532	13184	13411	13298	7264	7859	7533
18		95% octane	700	426	937	34	47	41	70	70	70	46	69	54
19			4500	2739	704	210	228	219	629	635	632	62	88	73
20			10000	6087	1100	1188	1193	1191	2674	3107	2891	578	629	601
21	Gromosol	None	0	0	655	6	6	6	10	10	10	78	110	91
22		Diesel	600	757	737	356	381	369	640	677	659	463	512	490
24			3500	4413	1419	2613	2917	2765	4441	4624	4533	2493	2706	2621
23			11000	13870	2376	11753	14593	13173	14705	14800	14753	10513	11219	10811
25		Kerosene	600	730	714	223	237	230	439	470	455	190	254	222
26			5000	6087	1728	3494	4169	3832	5588	5613	5601	1231	1376	1306
27			10000	12174	3320	5839	6209	6024	11245	11436	11341	7922	8510	8261
28		95% octane	500	304	739	20	20	20	51	62	57	10	10	10
29			5200	3165	1916	410	491	451	680	691	686	228	265	249
30			9000	5478	1885	958	1127	1043	1800	1852	1826	685	824	743