Analysis of forensic soil samples via high-performance liquid chromatography and ion chromatography

Traditional forensic soil comparisons are performed via physical and/or chemical examinations of color, texture, and mineral content, leaving any organic- or water-soluble fractions unexamined. This study uses high-performance liquid chromatography (HPLC) and ion chromatography (IC) to assess the qualitative and quantitative variation in these fractions of soil. Soil samples (n=120) were collected over the course of 3 weeks from urban, suburban, and rural locations in and around Lansing, MI. Additional samples from six of these locations (two urban, two suburban, and two rural) were collected once a week for 10 weeks for temporal analysis. Nine additional samples, equally spaced over a 1 m(2) grid, from these same six locations were collected for spatial analyses. Qualitative and quantitative analysis of the resultant chromatograms separated the 120 samples into 10 groups by HPLC and 23 groups by IC. This study shows that using HPLC and IC to analyze the organic- and water-soluble fractions of soil can successfully discriminate samples. Quantitative analysis of the results eliminates some false inclusions by providing further differentiation of samples. The results of this study indicate that adding HPLC and IC analyses to traditional forensic soil analysis schemes can improve overall sample differentiation. The methods used in this study were also able to detect both qualitative and quantitative variations in soil over a relatively small geographic area. This demonstration of soil heterogeneity underscores the importance of the collection of a representative known sample population when assessing a forensic soil comparison. Significant temporal variation was also demonstrated over the course of 10 weeks of sampling; however, samples were found to be consistent over shorter periods of time. Baseline levels of inorganic anions were determined via IC; these levels may be useful in assessing the significance of anions detected in soil from cases involving low explosives.     

The U.S. military and sexual violence against women

Abstract

The Bulletin of Concerned Asian Scholars (BCAS) created the “Notes from the Field” section in 1992 in an attempt to bring BCAS closer to its activist origins and goals by publishing brief reports on events and issues of particular concern in the world today. Not intended to duplicate BCAS's usual in-depth and well-documented analysis and research, these reports are meant to be a less formal equivalent of “field notes” describing what is happening or being debated or studied out there in the world of action. Although analysis is usually a valuable part of these presentations, the “Notes” are more akin to urgent notices or offerings for discussion. The name “Notes from the Field” is not meant to imply the colonialist concept of people reporting back from the so-called Third World, and even though the name can be seen to loosely apply to the field of Asian studies, it does not refer to reporting on the more strictly academic aspects of fields of study within academia. The hope is that the information and opinions presented in these “Notes from the Field” will inspire readers to concern themselves with issues that matter, either through further study and analysis or by speaking out or taking action more directly.

It has been reported that on 4 September 1995 two U.S. Marines and one U.S. Navy man stationed at Camp Hansen Marine Base in Kin, Okinawa, raped a twelve-year-old Okinawan girl. This situation caught the Okinawan, Japanese, and international media's attention, brought out an Okinawan demonstration of 90,000 people in the latest of “U.S. Bases Out Of Okinawa” demonstrations that go back at least to 1972 with the reversion of Okinawa to Japan, made apologies by U.S. president Clinton mandatory, and resulted in the turning over of the three servicemen to the justice of Japanese courts, itself an act reflecting the need of the U.S. military and civilian authorities to try to defuse the situation.     

Video Resource Guide for Asia and the Pacific

Abstract

This is an initial listing of videos and films. Additions or corrections would be appreciated. Entries are in alphabetical order under country headings, with topical sections at the end of the guide.     

Identification and Comparison of Electrical Tapes Using Instrumental and Statistical Techniques: II. Organic Composition of the Tape Backing and Adhesive*

Abstract: The microtexture and elemental composition of the backing of electrical tapes have been shown to be highly discriminating. In this study, the organic composition of electrical tape was evaluated as a complementary means of distinguishing tape brands. The backing and adhesive of 72 rolls of electrical tape were analyzed via Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR FTIR) and discriminant analysis was used to classify all samples by brand. Generally, the accuracy for FTIR data (88–99%) was higher than that for elemental data (86–94%). FTIR spectra from the adhesive layer were the most discriminating. In separate studies, two fragments of blast-damaged tape were correctly assigned to their brand of origin and discriminant analysis was used to quantitatively associate or exclude tape samples from two bombing cases.     

Identification and comparison of electrical tapes using instrumental and statistical techniques: I. Microscopic surface texture and elemental composition

Comparisons of polyvinyl chloride electrical tape typically rely upon evaluating class characteristics such as physical dimensions, surface texture, and chemical composition. Given the various techniques that are available for this purpose, a comprehensive study has been undertaken to establish an optimal analytical scheme for electrical tape comparisons. Of equal importance is the development of a quantitative means for sample discrimination. In this study, 67 rolls of black electrical tape representing 34 different nominal brands were analyzed via scanning electron microscopy and energy dispersive spectroscopy. Differences in surface roughness, calendering marks, and filler particle size were readily apparent, including between some rolls of the same nominal brand. The relative amounts of magnesium, aluminum, silicon, sulfur, lead, chlorine, antimony, calcium, titanium, and zinc varied greatly between brands and, in some cases, could be linked to the year of manufacture. For the first time, quantitative differentiation of electrical tapes was achieved through multivariate statistical techniques, with 36 classes identified within the sample population. A single-blind study was also completed where questioned tape samples were correctly associated with known exemplars. Finally, two case studies are presented where tape recovered from an improvised explosive device is compared with tape recovered from a suspect.