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Through smartphone measurement software, researchers will be able to collect vast amounts of log data on the use of mobile media and applications. The present paper discusses the opportunities of smartphone measurement software in multi-method research, but also the ethical and methodological issues involved. We provide suggestions on how to deal with obvious privacy issues that arise from using smartphone measurement software. We also discuss how one can deal with sampling and selecting respondents. An illustrative study in which we applied smartphone measurement suggests that methodological and ethical issues can be overcome in practice, although doing so requires a great deal of effort. Still, collecting data through smartphone measurement is highly promising as both the quality and quantity of the resulting data is impressive.

Although metallic elements occur naturally, they can occur or accumulate in organisms at levels toxic to the organism and/or their consumers. Concentrations of twenty-nine metallic elements in muscle tissue from sardine Sardinops sagax and chokka squid Loligo reynaudii from South Atlantic and Indian Ocean waters off South Africa were established, for the first time, using inductively-coupled plasma mass spectrometry. Chokka showed significantly higher (p < 0.05) concentrations of B, Cr, Zn, As, Se, Rb, Sr, Cd, and Tl and significantly lower concentrations of V, Mn, Ti, and Mo compared to sardine. There were also significant differences in some metallic elements between the two oceans. Multivariate analyses indicated possible population structure of both species, suggesting that these analyses may be useful as a stock discrimination tool. Only two sardine samples contained quantifiable Hg. Based on South African estimated daily intake, total hazard quotient, and European Union limits for Hg, Cd, and Pb, we consider tissues from sardine and chokka in South African waters to be safe for human consumption. ; Funding agencies: National Research Foundation (NRF) of South AfricaNational Research Foundation - South Africa