Length measurements are relatively easier to obtain than weight measurements. Length‐weight relationships provide a means of estimating weight based on length. Linear regressions using the model W = aLb were calculated from paired length and weight measurements (1972 through 1979) of Penaeus duorarum, P. occidentalis, P. setiferus, P. stylirostris, and P. vannamei cultured at the Texas A&M Shrimp Mariculture facility near Corpus Christi, Texas. Length‐frequency distributions and regression formulae for predicting weights from lengths are presented for each species.
This study explored the removal of contaminants from
surrogate
solutions using magnetite particles. Commercially available magnetite
was used for the removal of copper, lead, nitrate, and phosphate from
surrogate solutions. Single-stage experiments with copper, lead, and
phosphate surrogate solutions achieved over 98% removal, while nitrate
removal experiments only achieved 7.47%, in 24 h at high (20 g/L)
magnetite doses and initial concentrations of 100 mg contaminant/L.
Two-stage experiments with copper showed over 99.9% cumulative removal
after the second stage. Adsorption kinetics experiments for copper,
lead, and phosphate demonstrate rapid uptake of contaminants with
high doses of magnetite, removing over 90% of contaminants in 4 min
or less and follow a pseudo-second-order model. Ultimately, this study
aims to establish the minimum magnetite dose and/or minimum number
of stages required to remove contaminants below water quality standards
for human and/or aquatic life. Water pollution is a serious global
issue, and this study poses a potential solution that can be modified
for a variety of applications, including environmental contamination
and industrial wastewater treatment.
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