Applications of Environmental Aquatic Chemistry A Practical Guide 2nd. Edition by Eugene R. Weiner | 9780849390661 | 0849390664 | Holooly

Principles of Environmental

Applications of Environmental Aquatic Chemistry A Practical Guide

58 SOLVED PROBLEMS

Question: 7.1

USING GROUNDWATER CONCENTRATIONS TO ESTIMATE THE PROXIMITY OF RESIDUAL SINGLE-COMPONENT DNAPL Analysis of a water sample from a monitoring well indicated 6.4 mg/L of tetrachloro-ethene (PERC). Tetrachloroethene was a target contaminant because a dry cleaning establishment had once been on the site ...

Verified Answer:

Since the observed DNAPL is a pure solvent (tetrac...

Question: 7.2

USING GROUNDWATER CONCENTRATIONS TO ESTIMATE THE PROXIMITY OF RESIDUAL MULTICOMPONENT DNAPL MIXTURES, WHERE THE INITIAL COMPOSITION IS KNOWN A remediation project was being planned for a site that had contained a metal degreasing facility. The degreaser solution that was used consisted of 70 wt% ...

Verified Answer:

1. Convert the weight-percentages of each DNAPL co...

Question: 5.14

Calculate the retardation factor for tetrachloroethene (PCE*) in a silty clayey loam soil, using data from Table 5.5. Soil density is 2.5 g/cm³ and effective porosity is 31%. ...

Verified Answer:

For tetrachloroethene,

K_{oc} = 155

...

Question: 5.13

CALCULATION OF A SORPTION RETARDATION FACTOR Calculate the retardation factor for 1,2-dichloroethane (1,2-DCA) in a soil with 2.7% total organic carbon (TOC), dry bulk density of 1.7 g/cm^3 ,and effective soil porosity of 40%. ...

Verified Answer:

K_{d} = K_{oc}f_{oc}

where

K...

Question: 10.4

Estimate the pH of the soil of Example 3. ...

Verified Answer:

The percent base saturation was measured to be 68....

Question: 10.3

Suppose a clay is measured to have the following cations (in meq/100 g): Ca^2+ = 16.2, Mg^2+ = 4.4, K^+ = 0.1, Na^+ = 1.6, and H^+ = 10.2 What is its percent base saturation? ...

Verified Answer:

At the pH of the CEC measurement, the total CEC = ...

Question: 10.2

Water has begun to seep into the basement of a home. The home’s foundation is well above the water table and this problem had not been experienced before. The house is located about 50 ft downgradient from a main water line and one possibility is that a leak has occurred in the pipeline. The water ...

Verified Answer:

No. Water would have to travel at least 50 ft thro...

Question: 10.1

DETERMINATION OF SODIUM ADSORPTION RATIO Determine the SAR for two different water supplies, A and B. Measured concentrations were ...

Verified Answer:

1. Determine the

Ca^{2+}

,

Mg...

Question: 9.10

The radioactive isotope ^40 K (odd Z and odd N ) is naturally present in biological tissues and subjects humans to a certain amount of unavoidable internal radiation. The body of an adult weighing 70 kg contains about 170 g of potassium, mostly in intracellular fluids. The relative natural ...

Verified Answer:

1. First calculate the decay rate constant, k, wit...

Question: 9.9

Calculate the weight in grams, W, of 1 mCi (3.700×10^7 dps) of ^14 C from its half-life of 5720 years. ...

Verified Answer:

Half-life = t_{1/2} = \frac{0.693}{k}[/late...

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