Composition Analysis of Remaining Metal Particles on Ferrochrome Kitchen Knife / 法医学杂志

OBJECTIVE@#To establish a feasible evaluation index and method to identify composition of remaining metal particles on ferrochrome kitchen knife.@*METHODS@#The small samples of remaining metal particles were rubbed from the knives using filter paper. The composition of remaining metal particles was detected by scanning electron microscopy and energy dispersive X-ray spectrometer (SEM-EDX) and GSR particle analysis function, using mathematical methods to calculate the ratio (relative amount) of Fe and Cr in remaining metal particles.@*RESULTS@#The ratio (relative amount) of Fe and Cr of remaining metal particles had significant differences among most ferrochrome kitchen knives (P < 0.05).@*CONCLUSION@#Using GSR particle analysis function to quantitatively detect the ratio (relative amount) of Fe and Cr of remaining metal particles on ferrochrome kitchen knife, which can establish the feasible evaluation method to estimate such injury tool.

[Investigation of iron powder, hydrogen peroxide and iron hydrogen peroxide for removal of acid yellow powder 36 dye from aqueous solutions]

A great part of organic compounds cause more pollution in natural waters meet, are chemical dye material. Azo dyes have more usage in different industries. Azo dyes not only give undesirable dye to the water but also have mutation potential and carcinogenesis effects in human and cause the production of toxic substances in water environments. The purpose of this study is investigation of iron powder, hydrogen peroxide and iron powder-hydrogen peroxide processes in removal of acid yellow 36 dye from aqueous solutions. This study was conducted in laboratory scale. At this experiment synthetic solution was made from acid yellow 36 dye, and the removal of acid yellow 36 dye was studied by iron powder, hydrogen peroxide and iron powder-hydrogen peroxide processes .Also effect of dye concentration, pH solution, hydrogen peroxide concentration, iron powder concentration and the time of contact on decolorization, were evaluated. The results showed that iron powder-hydrogen peroxide process, compared to two other process has high decolorization power. Removal efficacy of iron powder-hydrogen peroxide process with H[2]O[2]=23.33 ml / L, pH=3, iron powder 2000 mg/L and 60 minute, was about 97.9% In general this investigation showed that, this method [Iron powder-hydrogen peroxide process] has high efficiency for removal of Azo dyes. But application this method in the industry, should be economically evaluated

Environmentally safe design of tailing dams for the management of iron ore tailings in Indian context.

The need for the disposal of iron ore tailings in an enviornmentally firiendly manner is of great concern. This paper investigates the soil engineering properties for the construction of iron ore tailing dam, its foundation, construction materials and design data used for the construction analysis of the tailing dam. Geophysical investigations were carried out to establish the bedrock below the spillway. A computer programme taking into account the Swedish Slip Circle Method of analysis was used in the stability analysis of dam. It also focuses on the charactierstics of the tailings reponsible for the determination of optimum size of tailing pond for the containment of the tailings. The studies on the settling characteristics of tailings indicate much less area in comparison to the area provided in the existing tailing ponds in India. In the proposed scheme, it is suggested to provide an additional unit of sedimentation tank before the disposal of tailings to the tailing pond.

Evaluación toxicológica de cromo, hierro, manganeso y sulfato de las aguas de mr y especies marinas de la Bahia de San Nicolas del Distrito de Marcona / Toxicology evaluation of chromium, iron, manganese and sulfate of sea water and seafood of Bahia San Nicolas, Marcona

Se evalua el riesgo de contaminación por cromo, hierro, manganeso y sulfatos en especies marinas de consumo habitual, procedentes de la Bahía de San Nicolas de Marcona, resultado de la actividad minera que se realiza en la zona. El cromo, hierro y manganeso se determinó por espectrofotometría de absorción atómica, los sulfatos por medición de la turbides en un espectrofotómetro. Los resultados obtenidos para las especies marinas se evalúan en relación con la ingesta promedio por día en una dieta normal (según OMS). Los resultados se comparan con los obtenidos en muestras de la zona de Chorillos en Lima considerada de baja contaminación por estos minerales. Los valoresmás significativos en las especies marinas se encuentran en choros y machas tanto para hierro como para sulfatos. Dichos valores se encuentran por debajo de las cantidades consideradas tóxicas por tanto no representan mayor riesgo para la salud de la población.